40681109731 has 2 divisors, whose sum is σ = 40681109732. Its totient is φ = 40681109730.

The previous prime is 40681109669. The next prime is 40681109783. The reversal of 40681109731 is 13790118604.

40681109731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40681109731 - 2⁷ = 40681109603 is a prime.

It is a super-2 number, since 2×40681109731² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40681109431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20340554865 + 20340554866.

It is an arithmetic number, because the mean of its divisors is an integer number (20340554866).

Almost surely, 2^40681109731 is an apocalyptic number.

40681109731 is a deficient number, since it is larger than the sum of its proper divisors (1).

40681109731 is an equidigital number, since it uses as much as digits as its factorization.

40681109731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 40681109731 in words is "forty billion, six hundred eighty-one million, one hundred nine thousand, seven hundred thirty-one".