91814731 has 2 divisors, whose sum is σ = 91814732. Its totient is φ = 91814730.

The previous prime is 91814729. The next prime is 91814741. The reversal of 91814731 is 13741819.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91814731 - 2¹ = 91814729 is a prime.

It is a super-2 number, since 2×91814731² = 16859889657204722, which contains 22 as substring.

Together with 91814729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91814711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45907365 + 45907366.

It is an arithmetic number, because the mean of its divisors is an integer number (45907366).

Almost surely, 2^91814731 is an apocalyptic number.

91814731 is a deficient number, since it is larger than the sum of its proper divisors (1).

91814731 is an equidigital number, since it uses as much as digits as its factorization.

91814731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 34.

The square root of 91814731 is about 9582.0003652682. Note that the first 3 decimals coincide. The cubic root of 91814731 is about 451.1325071190.

The spelling of 91814731 in words is "ninety-one million, eight hundred fourteen thousand, seven hundred thirty-one".