31997154 has 32 divisors (see below), whose sum is σ = 73641600. Its totient is φ = 9078912.

The previous prime is 31997153. The next prime is 31997171. The reversal of 31997154 is 45179913.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31997153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3702 + ... + 8814.

It is an arithmetic number, because the mean of its divisors is an integer number (2301300).

Almost surely, 2^31997154 is an apocalyptic number.

31997154 is an abundant number, since it is smaller than the sum of its proper divisors (41644446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31997154 is a wasteful number, since it uses less digits than its factorization.

31997154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5274.

The product of its digits is 34020, while the sum is 39.

The square root of 31997154 is about 5656.6026906616. The cubic root of 31997154 is about 317.4707981492.

The spelling of 31997154 in words is "thirty-one million, nine hundred ninety-seven thousand, one hundred fifty-four".