31131012111 has 8 divisors (see below), whose sum is σ = 42291186480. Its totient is φ = 20362422912.

The previous prime is 31131012109. The next prime is 31131012113. The reversal of 31131012111 is 11121013113.

It is an interprime number because it is at equal distance from previous prime (31131012109) and next prime (31131012113).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31131012111 - 2¹ = 31131012109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131012113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97896106 + ... + 97896423.

It is an arithmetic number, because the mean of its divisors is an integer number (5286398310).

Almost surely, 2^31131012111 is an apocalyptic number.

31131012111 is a deficient number, since it is larger than the sum of its proper divisors (11160174369).

31131012111 is a wasteful number, since it uses less digits than its factorization.

31131012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195792585.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 31131012111 its reverse (11121013113), we get a palindrome (42252025224).

The spelling of 31131012111 in words is "thirty-one billion, one hundred thirty-one million, twelve thousand, one hundred eleven".