31131102011 has 4 divisors (see below), whose sum is σ = 31890397224. Its totient is φ = 30371806800.

The previous prime is 31131101983. The next prime is 31131102019. The reversal of 31131102011 is 11020113113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11020113113 = 11279 ⋅977047.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31131102011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31131102019) 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, 379647545 + ... + 379647626.

It is an arithmetic number, because the mean of its divisors is an integer number (7972599306).

Almost surely, 2^31131102011 is an apocalyptic number.

31131102011 is a deficient number, since it is larger than the sum of its proper divisors (759295213).

31131102011 is an equidigital number, since it uses as much as digits as its factorization.

31131102011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759295212.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 31131102011 its reverse (11020113113), we get a palindrome (42151215124).

The spelling of 31131102011 in words is "thirty-one billion, one hundred thirty-one million, one hundred two thousand, eleven".