40821577631 has 2 divisors, whose sum is σ = 40821577632. Its totient is φ = 40821577630.

The previous prime is 40821577627. The next prime is 40821577637. The reversal of 40821577631 is 13677512804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40821577631 - 2² = 40821577627 is a prime.

It is a super-2 number, since 2×40821577631² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40821577637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20410788815 + 20410788816.

It is an arithmetic number, because the mean of its divisors is an integer number (20410788816).

Almost surely, 2^40821577631 is an apocalyptic number.

40821577631 is a deficient number, since it is larger than the sum of its proper divisors (1).

40821577631 is an equidigital number, since it uses as much as digits as its factorization.

40821577631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 40821577631 in words is "forty billion, eight hundred twenty-one million, five hundred seventy-seven thousand, six hundred thirty-one".