31651876138 has 4 divisors (see below), whose sum is σ = 47477814210. Its totient is φ = 15825938068.

The previous prime is 31651876129. The next prime is 31651876147. The reversal of 31651876138 is 83167815613.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (31651876129) and next prime (31651876147).

It can be written as a sum of positive squares in only one way, i.e., 31625998569 + 25877569 = 177837^2 + 5087^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31651876091 and 31651876100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7912969033 + ... + 7912969036.

Almost surely, 2^31651876138 is an apocalyptic number.

31651876138 is a deficient number, since it is larger than the sum of its proper divisors (15825938072).

31651876138 is a wasteful number, since it uses less digits than its factorization.

31651876138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15825938071.

The product of its digits is 725760, while the sum is 49.

The spelling of 31651876138 in words is "thirty-one billion, six hundred fifty-one million, eight hundred seventy-six thousand, one hundred thirty-eight".