40608991 has 2 divisors, whose sum is σ = 40608992. Its totient is φ = 40608990.

The previous prime is 40608959. The next prime is 40609013. The reversal of 40608991 is 19980604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40608991 - 2⁵ = 40608959 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40608991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40608391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20304495 + 20304496.

It is an arithmetic number, because the mean of its divisors is an integer number (20304496).

Almost surely, 2^40608991 is an apocalyptic number.

40608991 is a deficient number, since it is larger than the sum of its proper divisors (1).

40608991 is an equidigital number, since it uses as much as digits as its factorization.

40608991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 40608991 is about 6372.5184189612. The cubic root of 40608991 is about 343.7220549845.

The spelling of 40608991 in words is "forty million, six hundred eight thousand, nine hundred ninety-one".