31311442 has 4 divisors (see below), whose sum is σ = 46967166. Its totient is φ = 15655720.

The previous prime is 31311437. The next prime is 31311461. The reversal of 31311442 is 24411313.

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., 30349081 + 962361 = 5509^2 + 981^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7827859 + ... + 7827862.

Almost surely, 2^31311442 is an apocalyptic number.

31311442 is a deficient number, since it is larger than the sum of its proper divisors (15655724).

31311442 is a wasteful number, since it uses less digits than its factorization.

31311442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15655723.

The product of its digits is 288, while the sum is 19.

The square root of 31311442 is about 5595.6627846932. The cubic root of 31311442 is about 315.1865595139.

Adding to 31311442 its reverse (24411313), we get a palindrome (55722755).

The spelling of 31311442 in words is "thirty-one million, three hundred eleven thousand, four hundred forty-two".