1313017731 has 12 divisors (see below), whose sum is σ = 1896949080. Its totient is φ = 875175360.

The previous prime is 1313017723. The next prime is 1313017733. The reversal of 1313017731 is 1377103131.

It is a happy number.

It is not a de Polignac number, because 1313017731 - 2³ = 1313017723 is a prime.

It is a super-2 number, since 2×1313017731² = 3448031123840776722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1313017695 and 1313017704.

It is not an unprimeable number, because it can be changed into a prime (1313017733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50251 + ... + 71771.

It is an arithmetic number, because the mean of its divisors is an integer number (158079090).

Almost surely, 2^1313017731 is an apocalyptic number.

1313017731 is a deficient number, since it is larger than the sum of its proper divisors (583931349).

1313017731 is a wasteful number, since it uses less digits than its factorization.

1313017731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28306 (or 28303 counting only the distinct ones).

The product of its (nonzero) digits is 1323, while the sum is 27.

The square root of 1313017731 is about 36235.5865276112. The cubic root of 1313017731 is about 1095.0237287658.

The spelling of 1313017731 in words is "one billion, three hundred thirteen million, seventeen thousand, seven hundred thirty-one".