91040006731 has 2 divisors, whose sum is σ = 91040006732. Its totient is φ = 91040006730.

The previous prime is 91040006689. The next prime is 91040006753. The reversal of 91040006731 is 13760004019.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13760004019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91040006731 - 2⁹ = 91040006219 is a prime.

It is a super-2 number, since 2×91040006731² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91040006693 and 91040006702.

It is not a weakly prime, because it can be changed into another prime (91040096731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45520003365 + 45520003366.

It is an arithmetic number, because the mean of its divisors is an integer number (45520003366).

Almost surely, 2^91040006731 is an apocalyptic number.

91040006731 is a deficient number, since it is larger than the sum of its proper divisors (1).

91040006731 is an equidigital number, since it uses as much as digits as its factorization.

91040006731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The spelling of 91040006731 in words is "ninety-one billion, forty million, six thousand, seven hundred thirty-one".