31106405633621 has 4 divisors (see below), whose sum is σ = 31616346709644. Its totient is φ = 30596464557600.

The previous prime is 31106405633599. The next prime is 31106405633623. The reversal of 31106405633621 is 12633650460113.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9855135425521 + 21251270208100 = 3139289^2 + 4609910^2 .

It is a cyclic number.

It is not a de Polignac number, because 31106405633621 - 2¹⁴ = 31106405617237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31106405633623) 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, 254970537920 + ... + 254970538041.

It is an arithmetic number, because the mean of its divisors is an integer number (7904086677411).

Almost surely, 2^{31106405633621} is an apocalyptic number.

It is an amenable number.

31106405633621 is a deficient number, since it is larger than the sum of its proper divisors (509941076023).

31106405633621 is an equidigital number, since it uses as much as digits as its factorization.

31106405633621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509941076022.

The product of its (nonzero) digits is 233280, while the sum is 41.

The spelling of 31106405633621 in words is "thirty-one trillion, one hundred six billion, four hundred five million, six hundred thirty-three thousand, six hundred twenty-one".