31043561413 has 4 divisors (see below), whose sum is σ = 31091991948. Its totient is φ = 30995130880.

The previous prime is 31043561359. The next prime is 31043561533. The reversal of 31043561413 is 31416534013.

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 30082127364 + 961434049 = 173442^2 + 31007^2 .

It is a cyclic number.

It is not a de Polignac number, because 31043561413 - 2²⁵ = 31010006981 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 (31043561113) 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, 24214306 + ... + 24215587.

It is an arithmetic number, because the mean of its divisors is an integer number (7772997987).

Almost surely, 2^31043561413 is an apocalyptic number.

It is an amenable number.

31043561413 is a deficient number, since it is larger than the sum of its proper divisors (48430535).

31043561413 is an equidigital number, since it uses as much as digits as its factorization.

31043561413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48430534.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 31043561413 in words is "thirty-one billion, forty-three million, five hundred sixty-one thousand, four hundred thirteen".