31157001 has 16 divisors (see below), whose sum is σ = 46811520. Its totient is φ = 20477520.

The previous prime is 31156987. The next prime is 31157003. The reversal of 31157001 is 10075113.

It is a happy number.

It is not a de Polignac number, because 31157001 - 2¹¹ = 31154953 is a prime.

It is a super-2 number, since 2×31157001² = 1941517422628002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31157003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6210 + ... + 10043.

It is an arithmetic number, because the mean of its divisors is an integer number (2925720).

Almost surely, 2^31157001 is an apocalyptic number.

It is an amenable number.

31157001 is a deficient number, since it is larger than the sum of its proper divisors (15654519).

31157001 is a wasteful number, since it uses less digits than its factorization.

31157001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16333 (or 16327 counting only the distinct ones).

The product of its (nonzero) digits is 105, while the sum is 18.

The square root of 31157001 is about 5581.8456625027. The cubic root of 31157001 is about 314.6674949456.

The spelling of 31157001 in words is "thirty-one million, one hundred fifty-seven thousand, one".