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631205630461261 is a prime number
BaseRepresentation
bin1000111110000101000000001…
…1011000100100010101001101
310001202220200001200000010000001
42033201100003120210111031
51130213133112344230021
610114243510304404301
7246645046642535362
oct21741200330442515
93052820050003001
10631205630461261
11173137893997a59
125a963a68616691
1321128587b94c4b
14b1c273083a469
154ce9191122091
hex23e140362454d

631205630461261 has 2 divisors, whose sum is σ = 631205630461262. Its totient is φ = 631205630461260.

The previous prime is 631205630461207. The next prime is 631205630461267. The reversal of 631205630461261 is 162164036502136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403143351264900 + 228062279196361 = 20078430^2 + 15101731^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-631205630461261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631205630461267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315602815230630 + 315602815230631.

It is an arithmetic number, because the mean of its divisors is an integer number (315602815230631).

Almost surely, 2631205630461261 is an apocalyptic number.

It is an amenable number.

631205630461261 is a deficient number, since it is larger than the sum of its proper divisors (1).

631205630461261 is an equidigital number, since it uses as much as digits as its factorization.

631205630461261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 46.

Adding to 631205630461261 its reverse (162164036502136), we get a palindrome (793369666963397).

The spelling of 631205630461261 in words is "six hundred thirty-one trillion, two hundred five billion, six hundred thirty million, four hundred sixty-one thousand, two hundred sixty-one".