91772347 has 2 divisors, whose sum is σ = 91772348. Its totient is φ = 91772346.

The previous prime is 91772311. The next prime is 91772357. The reversal of 91772347 is 74327719.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91772347 - 2¹⁵ = 91739579 is a prime.

It is not a weakly prime, because it can be changed into another prime (91772357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45886173 + 45886174.

It is an arithmetic number, because the mean of its divisors is an integer number (45886174).

Almost surely, 2^91772347 is an apocalyptic number.

91772347 is a deficient number, since it is larger than the sum of its proper divisors (1).

91772347 is an equidigital number, since it uses as much as digits as its factorization.

91772347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088, while the sum is 40.

The square root of 91772347 is about 9579.7884632178. The cubic root of 91772347 is about 451.0630783794.

The spelling of 91772347 in words is "ninety-one million, seven hundred seventy-two thousand, three hundred forty-seven".