31974149 has 4 divisors (see below), whose sum is σ = 32177964. Its totient is φ = 31770336.

The previous prime is 31974143. The next prime is 31974157. The reversal of 31974149 is 94147913.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23668225 + 8305924 = 4865^2 + 2882^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31974149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31974143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101672 + ... + 101985.

It is an arithmetic number, because the mean of its divisors is an integer number (8044491).

Almost surely, 2^31974149 is an apocalyptic number.

It is an amenable number.

31974149 is a deficient number, since it is larger than the sum of its proper divisors (203815).

31974149 is a wasteful number, since it uses less digits than its factorization.

31974149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203814.

The product of its digits is 27216, while the sum is 38.

The square root of 31974149 is about 5654.5688606648. The cubic root of 31974149 is about 317.3946958941.

It can be divided in two parts, 31974 and 149, that added together give a palindrome (32123).

The spelling of 31974149 in words is "thirty-one million, nine hundred seventy-four thousand, one hundred forty-nine".