40404301991 has 2 divisors, whose sum is σ = 40404301992. Its totient is φ = 40404301990.

The previous prime is 40404301979. The next prime is 40404302041. The reversal of 40404301991 is 19910340404.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40404301991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40404301891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202150995 + 20202150996.

It is an arithmetic number, because the mean of its divisors is an integer number (20202150996).

Almost surely, 2^40404301991 is an apocalyptic number.

40404301991 is a deficient number, since it is larger than the sum of its proper divisors (1).

40404301991 is an equidigital number, since it uses as much as digits as its factorization.

40404301991 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 35.

The spelling of 40404301991 in words is "forty billion, four hundred four million, three hundred one thousand, nine hundred ninety-one".