91771751 has 2 divisors, whose sum is σ = 91771752. Its totient is φ = 91771750.

The previous prime is 91771721. The next prime is 91771769. The reversal of 91771751 is 15717719.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91771751 - 2¹⁰ = 91770727 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91771721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45885875 + 45885876.

It is an arithmetic number, because the mean of its divisors is an integer number (45885876).

Almost surely, 2^91771751 is an apocalyptic number.

91771751 is a deficient number, since it is larger than the sum of its proper divisors (1).

91771751 is an equidigital number, since it uses as much as digits as its factorization.

91771751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15435, while the sum is 38.

The square root of 91771751 is about 9579.7573560086. The cubic root of 91771751 is about 451.0621019263.

The spelling of 91771751 in words is "ninety-one million, seven hundred seventy-one thousand, seven hundred fifty-one".