1261602031 has 2 divisors, whose sum is σ = 1261602032. Its totient is φ = 1261602030.

The previous prime is 1261602019. The next prime is 1261602101. The reversal of 1261602031 is 1302061621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1261602031 - 2²⁵ = 1228047599 is a prime.

It is a super-2 number, since 2×1261602031² = 3183279369246649922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1261601993 and 1261602011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261602731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630801015 + 630801016.

It is an arithmetic number, because the mean of its divisors is an integer number (630801016).

Almost surely, 2^1261602031 is an apocalyptic number.

1261602031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261602031 is an equidigital number, since it uses as much as digits as its factorization.

1261602031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1261602031 is about 35519.0375854977. The cubic root of 1261602031 is about 1080.5398624086.

Adding to 1261602031 its reverse (1302061621), we get a palindrome (2563663652).

The spelling of 1261602031 in words is "one billion, two hundred sixty-one million, six hundred two thousand, thirty-one".