40049591 has 2 divisors, whose sum is σ = 40049592. Its totient is φ = 40049590.

The previous prime is 40049563. The next prime is 40049599. The reversal of 40049591 is 19594004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40049591 is a prime.

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 (40049599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20024795 + 20024796.

It is an arithmetic number, because the mean of its divisors is an integer number (20024796).

Almost surely, 2^40049591 is an apocalyptic number.

40049591 is a deficient number, since it is larger than the sum of its proper divisors (1).

40049591 is an equidigital number, since it uses as much as digits as its factorization.

40049591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 40049591 is about 6328.4746187371. The cubic root of 40049591 is about 342.1364633307.

The spelling of 40049591 in words is "forty million, forty-nine thousand, five hundred ninety-one".