31423512 has 16 divisors (see below), whose sum is σ = 78558840. Its totient is φ = 10474496.

The previous prime is 31423499. The next prime is 31423517. The reversal of 31423512 is 21532413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423517) 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, 654633 + ... + 654680.

Almost surely, 2^31423512 is an apocalyptic number.

It is an amenable number.

31423512 is an abundant number, since it is smaller than the sum of its proper divisors (47135328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31423512 is a wasteful number, since it uses less digits than its factorization.

31423512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309322 (or 1309318 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 31423512 is about 5605.6678460287. The cubic root of 31423512 is about 315.5621506332.

Adding to 31423512 its reverse (21532413), we get a palindrome (52955925).

The spelling of 31423512 in words is "thirty-one million, four hundred twenty-three thousand, five hundred twelve".