31423075 has 6 divisors (see below), whose sum is σ = 38964644. Its totient is φ = 25138440.

The previous prime is 31423039. The next prime is 31423081. The reversal of 31423075 is 57032413.

It is a de Polignac number, because none of the positive numbers 2^k-31423075 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 1256923 = 31423075 / (3 + 1 + 4 + 2 + 3 + 0 + 7 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 628437 + ... + 628486.

Almost surely, 2^31423075 is an apocalyptic number.

31423075 is a deficient number, since it is larger than the sum of its proper divisors (7541569).

31423075 is a wasteful number, since it uses less digits than its factorization.

31423075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256933 (or 1256928 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 31423075 is about 5605.6288674867. The cubic root of 31423075 is about 315.5606878082.

Adding to 31423075 its reverse (57032413), we get a palindrome (88455488).

The spelling of 31423075 in words is "thirty-one million, four hundred twenty-three thousand, seventy-five".