40591591 has 2 divisors, whose sum is σ = 40591592. Its totient is φ = 40591590.

The previous prime is 40591583. The next prime is 40591601. The reversal of 40591591 is 19519504.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40591591 - 2³ = 40591583 is a prime.

It is a super-2 number, since 2×40591591² = 3295354519822562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40591531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20295795 + 20295796.

It is an arithmetic number, because the mean of its divisors is an integer number (20295796).

Almost surely, 2^40591591 is an apocalyptic number.

40591591 is a deficient number, since it is larger than the sum of its proper divisors (1).

40591591 is an equidigital number, since it uses as much as digits as its factorization.

40591591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 40591591 is about 6371.1530353618. The cubic root of 40591591 is about 343.6729556921.

The spelling of 40591591 in words is "forty million, five hundred ninety-one thousand, five hundred ninety-one".