91253731 has 2 divisors, whose sum is σ = 91253732. Its totient is φ = 91253730.

The previous prime is 91253711. The next prime is 91253737. The reversal of 91253731 is 13735219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91253731 - 2¹⁷ = 91122659 is a prime.

It is a super-2 number, since 2×91253731² = 16654486842840722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91253693 and 91253702.

It is not a weakly prime, because it can be changed into another prime (91253737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45626865 + 45626866.

It is an arithmetic number, because the mean of its divisors is an integer number (45626866).

Almost surely, 2^91253731 is an apocalyptic number.

91253731 is a deficient number, since it is larger than the sum of its proper divisors (1).

91253731 is an equidigital number, since it uses as much as digits as its factorization.

91253731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670, while the sum is 31.

The square root of 91253731 is about 9552.6818747407. The cubic root of 91253731 is about 450.2118031748.

The spelling of 91253731 in words is "ninety-one million, two hundred fifty-three thousand, seven hundred thirty-one".