31551011105 has 4 divisors (see below), whose sum is σ = 37861213332. Its totient is φ = 25240808880.

The previous prime is 31551011099. The next prime is 31551011119. The reversal of 31551011105 is 50111015513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50111015513 = 13 ⋅3854693501.

It can be written as a sum of positive squares in 2 ways, for example, as 10021611664 + 21529399441 = 100108^2 + 146729^2 .

It is not a de Polignac number, because 31551011105 - 2¹² = 31551007009 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3155101106 + ... + 3155101115.

It is an arithmetic number, because the mean of its divisors is an integer number (9465303333).

Almost surely, 2^31551011105 is an apocalyptic number.

It is an amenable number.

31551011105 is a deficient number, since it is larger than the sum of its proper divisors (6310202227).

31551011105 is an equidigital number, since it uses as much as digits as its factorization.

31551011105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6310202226.

The product of its (nonzero) digits is 375, while the sum is 23.

Adding to 31551011105 its reverse (50111015513), we get a palindrome (81662026618).

The spelling of 31551011105 in words is "thirty-one billion, five hundred fifty-one million, eleven thousand, one hundred five".