31136180921 has 8 divisors (see below), whose sum is σ = 31231041600. Its totient is φ = 31041465840.

The previous prime is 31136180857. The next prime is 31136180941. The reversal of 31136180921 is 12908163113.

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 31136180921 - 2⁶ = 31136180857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31136180941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399860 + ... + 471338.

It is an arithmetic number, because the mean of its divisors is an integer number (3903880200).

Almost surely, 2^31136180921 is an apocalyptic number.

It is an amenable number.

31136180921 is a deficient number, since it is larger than the sum of its proper divisors (94860679).

31136180921 is an equidigital number, since it uses as much as digits as its factorization.

31136180921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72799.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 31136180921 in words is "thirty-one billion, one hundred thirty-six million, one hundred eighty thousand, nine hundred twenty-one".