91131673 has 2 divisors, whose sum is σ = 91131674. Its totient is φ = 91131672.

The previous prime is 91131653. The next prime is 91131697. The reversal of 91131673 is 37613119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76177984 + 14953689 = 8728^2 + 3867^2 .

It is a cyclic number.

It is not a de Polignac number, because 91131673 - 2⁵ = 91131641 is a prime.

It is not a weakly prime, because it can be changed into another prime (91131653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45565836 + 45565837.

It is an arithmetic number, because the mean of its divisors is an integer number (45565837).

Almost surely, 2^91131673 is an apocalyptic number.

It is an amenable number.

91131673 is a deficient number, since it is larger than the sum of its proper divisors (1).

91131673 is an equidigital number, since it uses as much as digits as its factorization.

91131673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 31.

The square root of 91131673 is about 9546.2910598829. The cubic root of 91131673 is about 450.0109840940.

The spelling of 91131673 in words is "ninety-one million, one hundred thirty-one thousand, six hundred seventy-three".