40513612891 has 2 divisors, whose sum is σ = 40513612892. Its totient is φ = 40513612890.

The previous prime is 40513612831. The next prime is 40513612921. The reversal of 40513612891 is 19821631504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40513612891 - 2¹⁵ = 40513580123 is a prime.

It is not a weakly prime, because it can be changed into another prime (40513612831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20256806445 + 20256806446.

It is an arithmetic number, because the mean of its divisors is an integer number (20256806446).

Almost surely, 2^40513612891 is an apocalyptic number.

40513612891 is a deficient number, since it is larger than the sum of its proper divisors (1).

40513612891 is an equidigital number, since it uses as much as digits as its factorization.

40513612891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 40513612891 in words is "forty billion, five hundred thirteen million, six hundred twelve thousand, eight hundred ninety-one".