31216023 has 12 divisors (see below), whose sum is σ = 46760168. Its totient is φ = 20810520.

The previous prime is 31216021. The next prime is 31216043. The reversal of 31216023 is 32061213.

It is not a de Polignac number, because 31216023 - 2¹ = 31216021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31215987 and 31216005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31216021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63988 + ... + 64473.

Almost surely, 2^31216023 is an apocalyptic number.

31216023 is a deficient number, since it is larger than the sum of its proper divisors (15544145).

31216023 is an equidigital number, since it uses as much as digits as its factorization.

31216023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128476 (or 128464 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 31216023 is about 5587.1301219857. The cubic root of 31216023 is about 314.8660655096.

Adding to 31216023 its reverse (32061213), we get a palindrome (63277236).

The spelling of 31216023 in words is "thirty-one million, two hundred sixteen thousand, twenty-three".