40691242591 has 2 divisors, whose sum is σ = 40691242592. Its totient is φ = 40691242590.

The previous prime is 40691242583. The next prime is 40691242621. The reversal of 40691242591 is 19524219604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40691242591 - 2³ = 40691242583 is a prime.

It is a super-2 number, since 2×40691242591² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40691242561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20345621295 + 20345621296.

It is an arithmetic number, because the mean of its divisors is an integer number (20345621296).

Almost surely, 2^40691242591 is an apocalyptic number.

40691242591 is a deficient number, since it is larger than the sum of its proper divisors (1).

40691242591 is an equidigital number, since it uses as much as digits as its factorization.

40691242591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 40691242591 in words is "forty billion, six hundred ninety-one million, two hundred forty-two thousand, five hundred ninety-one".