31544406541 has 4 divisors (see below), whose sum is σ = 31551565500. Its totient is φ = 31537247584.

The previous prime is 31544406539. The next prime is 31544406563. The reversal of 31544406541 is 14560444513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14560444513 = 41 ⋅355132793.

It can be written as a sum of positive squares in 2 ways, for example, as 3335524516 + 28208882025 = 57754^2 + 167955^2 .

It is a cyclic number.

It is not a de Polignac number, because 31544406541 - 2¹ = 31544406539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31544406541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31544406241) 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, 3572866 + ... + 3581683.

It is an arithmetic number, because the mean of its divisors is an integer number (7887891375).

Almost surely, 2^31544406541 is an apocalyptic number.

It is an amenable number.

31544406541 is a deficient number, since it is larger than the sum of its proper divisors (7158959).

31544406541 is an equidigital number, since it uses as much as digits as its factorization.

31544406541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7158958.

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 31544406541 in words is "thirty-one billion, five hundred forty-four million, four hundred six thousand, five hundred forty-one".