31106213787 has 18 divisors (see below), whose sum is σ = 45593095324. Its totient is φ = 18850214240.

The previous prime is 31106213783. The next prime is 31106213807. The reversal of 31106213787 is 78731260113.

It is not a de Polignac number, because 31106213787 - 2² = 31106213783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31106213783) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3355663 + ... + 3364919.

Almost surely, 2^31106213787 is an apocalyptic number.

31106213787 is a deficient number, since it is larger than the sum of its proper divisors (14486881537).

31106213787 is an frugal number, since it uses more digits than its factorization.

31106213787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18539 (or 9271 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The spelling of 31106213787 in words is "thirty-one billion, one hundred six million, two hundred thirteen thousand, seven hundred eighty-seven".