40987860491 has 2 divisors, whose sum is σ = 40987860492. Its totient is φ = 40987860490.

The previous prime is 40987860469. The next prime is 40987860541. The reversal of 40987860491 is 19406878904.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40987860491 - 2¹⁸ = 40987598347 is a prime.

It is a super-2 number, since 2×40987860491² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40987860191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20493930245 + 20493930246.

It is an arithmetic number, because the mean of its divisors is an integer number (20493930246).

Almost surely, 2^40987860491 is an apocalyptic number.

40987860491 is a deficient number, since it is larger than the sum of its proper divisors (1).

40987860491 is an equidigital number, since it uses as much as digits as its factorization.

40987860491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 40987860491 in words is "forty billion, nine hundred eighty-seven million, eight hundred sixty thousand, four hundred ninety-one".