31251216139 has 8 divisors (see below), whose sum is σ = 36714715632. Its totient is φ = 26224796640.

The previous prime is 31251216091. The next prime is 31251216149. The reversal of 31251216139 is 93161215213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31251216139 - 2⁷ = 31251216011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31251216149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109269844 + ... + 109270129.

It is an arithmetic number, because the mean of its divisors is an integer number (4589339454).

Almost surely, 2^31251216139 is an apocalyptic number.

31251216139 is a deficient number, since it is larger than the sum of its proper divisors (5463499493).

31251216139 is a wasteful number, since it uses less digits than its factorization.

31251216139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218539997.

The product of its digits is 9720, while the sum is 34.

The spelling of 31251216139 in words is "thirty-one billion, two hundred fifty-one million, two hundred sixteen thousand, one hundred thirty-nine".