31791434 has 4 divisors (see below), whose sum is σ = 47687154. Its totient is φ = 15895716.

The previous prime is 31791413. The next prime is 31791439. The reversal of 31791434 is 43419713.

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

It can be written as a sum of positive squares in only one way, i.e., 18447025 + 13344409 = 4295^2 + 3653^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31791434.

It is not an unprimeable number, because it can be changed into a prime (31791439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7947857 + ... + 7947860.

Almost surely, 2^31791434 is an apocalyptic number.

31791434 is a deficient number, since it is larger than the sum of its proper divisors (15895720).

31791434 is a wasteful number, since it uses less digits than its factorization.

31791434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15895719.

The product of its digits is 9072, while the sum is 32.

The square root of 31791434 is about 5638.3893090137. The cubic root of 31791434 is about 316.7889608289.

The spelling of 31791434 in words is "thirty-one million, seven hundred ninety-one thousand, four hundred thirty-four".