91371751 has 2 divisors, whose sum is σ = 91371752. Its totient is φ = 91371750.

The previous prime is 91371743. The next prime is 91371767. The reversal of 91371751 is 15717319.

It is a weak prime.

It is an emirp because it is prime and its reverse (15717319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91371751 - 2³ = 91371743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91371701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45685875 + 45685876.

It is an arithmetic number, because the mean of its divisors is an integer number (45685876).

Almost surely, 2^91371751 is an apocalyptic number.

91371751 is a deficient number, since it is larger than the sum of its proper divisors (1).

91371751 is an equidigital number, since it uses as much as digits as its factorization.

91371751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6615, while the sum is 34.

The square root of 91371751 is about 9558.8572015697. The cubic root of 91371751 is about 450.4058084190.

The spelling of 91371751 in words is "ninety-one million, three hundred seventy-one thousand, seven hundred fifty-one".