31144042 has 4 divisors (see below), whose sum is σ = 46716066. Its totient is φ = 15572020.

The previous prime is 31144039. The next prime is 31144049. The reversal of 31144042 is 24044113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24044113 = 653 ⋅36821.

It can be written as a sum of positive squares in only one way, i.e., 29931841 + 1212201 = 5471^2 + 1101^2 .

It is not an unprimeable number, because it can be changed into a prime (31144049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7786009 + ... + 7786012.

Almost surely, 2^31144042 is an apocalyptic number.

31144042 is a deficient number, since it is larger than the sum of its proper divisors (15572024).

31144042 is a wasteful number, since it uses less digits than its factorization.

31144042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15572023.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 31144042 is about 5580.6847250136. The cubic root of 31144042 is about 314.6238627878.

Adding to 31144042 its reverse (24044113), we get a palindrome (55188155).

The spelling of 31144042 in words is "thirty-one million, one hundred forty-four thousand, forty-two".