31612728011 has 2 divisors, whose sum is σ = 31612728012. Its totient is φ = 31612728010.

The previous prime is 31612727983. The next prime is 31612728073. The reversal of 31612728011 is 11082721613.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31612728011 - 2²² = 31608533707 is a prime.

It is a super-2 number, since 2×31612728011² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31612728211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15806364005 + 15806364006.

It is an arithmetic number, because the mean of its divisors is an integer number (15806364006).

Almost surely, 2^31612728011 is an apocalyptic number.

31612728011 is a deficient number, since it is larger than the sum of its proper divisors (1).

31612728011 is an equidigital number, since it uses as much as digits as its factorization.

31612728011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 31612728011 in words is "thirty-one billion, six hundred twelve million, seven hundred twenty-eight thousand, eleven".