620534261 has 2 divisors, whose sum is σ = 620534262. Its totient is φ = 620534260.

The previous prime is 620534231. The next prime is 620534287. The reversal of 620534261 is 162435026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 324900625 + 295633636 = 18025^2 + 17194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620534261 is a prime.

It is a super-2 number, since 2×620534261² = 770125538149632242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620534231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310267130 + 310267131.

It is an arithmetic number, because the mean of its divisors is an integer number (310267131).

Almost surely, 2^620534261 is an apocalyptic number.

It is an amenable number.

620534261 is a deficient number, since it is larger than the sum of its proper divisors (1).

620534261 is an equidigital number, since it uses as much as digits as its factorization.

620534261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 620534261 is about 24910.5251048628. The cubic root of 620534261 is about 852.9467556272.

Adding to 620534261 its reverse (162435026), we get a palindrome (782969287).

The spelling of 620534261 in words is "six hundred twenty million, five hundred thirty-four thousand, two hundred sixty-one".