31056728111 has 4 divisors (see below), whose sum is σ = 32127649800. Its totient is φ = 29985806424.

The previous prime is 31056728071. The next prime is 31056728123. The reversal of 31056728111 is 11182765013.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31056728111 is a prime.

It is a super-4 number, since 4×31056728111⁴ (a number of 43 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31056718111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535460801 + ... + 535460858.

It is an arithmetic number, because the mean of its divisors is an integer number (8031912450).

Almost surely, 2^31056728111 is an apocalyptic number.

31056728111 is a deficient number, since it is larger than the sum of its proper divisors (1070921689).

31056728111 is a wasteful number, since it uses less digits than its factorization.

31056728111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070921688.

The product of its (nonzero) digits is 10080, while the sum is 35.

The spelling of 31056728111 in words is "thirty-one billion, fifty-six million, seven hundred twenty-eight thousand, one hundred eleven".