1261602101 has 2 divisors, whose sum is σ = 1261602102. Its totient is φ = 1261602100.

The previous prime is 1261602031. The next prime is 1261602137. The reversal of 1261602101 is 1012061621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 840942001 + 420660100 = 28999^2 + 20510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261602101 - 2²² = 1257407797 is a prime.

It is a super-2 number, since 2×1261602101² = 3183279722495228402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261602191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630801050 + 630801051.

It is an arithmetic number, because the mean of its divisors is an integer number (630801051).

Almost surely, 2^1261602101 is an apocalyptic number.

It is an amenable number.

1261602101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261602101 is an equidigital number, since it uses as much as digits as its factorization.

1261602101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1261602101 is about 35519.0385708848. The cubic root of 1261602101 is about 1080.5398823932.

Adding to 1261602101 its reverse (1012061621), we get a palindrome (2273663722).

The spelling of 1261602101 in words is "one billion, two hundred sixty-one million, six hundred two thousand, one hundred one".