40405861091 has 2 divisors, whose sum is σ = 40405861092. Its totient is φ = 40405861090.

The previous prime is 40405861081. The next prime is 40405861117. The reversal of 40405861091 is 19016850404.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40405861091 is a prime.

It is a super-2 number, since 2×40405861091² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (40405861081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202930545 + 20202930546.

It is an arithmetic number, because the mean of its divisors is an integer number (20202930546).

Almost surely, 2^40405861091 is an apocalyptic number.

40405861091 is a deficient number, since it is larger than the sum of its proper divisors (1).

40405861091 is an equidigital number, since it uses as much as digits as its factorization.

40405861091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 40405861091 in words is "forty billion, four hundred five million, eight hundred sixty-one thousand, ninety-one".