31331300138 has 4 divisors (see below), whose sum is σ = 46996950210. Its totient is φ = 15665650068.

The previous prime is 31331300137. The next prime is 31331300149. The reversal of 31331300138 is 83100313313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83100313313 = 2447 ⋅33960079.

It can be written as a sum of positive squares in only one way, i.e., 22181038489 + 9150261649 = 148933^2 + 95657^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31331300137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7832825033 + ... + 7832825036.

Almost surely, 2^31331300138 is an apocalyptic number.

31331300138 is a deficient number, since it is larger than the sum of its proper divisors (15665650072).

31331300138 is a wasteful number, since it uses less digits than its factorization.

31331300138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15665650071.

The product of its (nonzero) digits is 1944, while the sum is 26.

The spelling of 31331300138 in words is "thirty-one billion, three hundred thirty-one million, three hundred thousand, one hundred thirty-eight".