91637201 has 2 divisors, whose sum is σ = 91637202. Its totient is φ = 91637200.

The previous prime is 91637179. The next prime is 91637213. The reversal of 91637201 is 10273619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61606801 + 30030400 = 7849^2 + 5480^2 .

It is a cyclic number.

It is not a de Polignac number, because 91637201 - 2⁶ = 91637137 is a prime.

It is a super-2 number, since 2×91637201² = 16794753214228802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91937201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45818600 + 45818601.

It is an arithmetic number, because the mean of its divisors is an integer number (45818601).

Almost surely, 2^91637201 is an apocalyptic number.

It is an amenable number.

91637201 is a deficient number, since it is larger than the sum of its proper divisors (1).

91637201 is an equidigital number, since it uses as much as digits as its factorization.

91637201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 91637201 is about 9572.7321596292. The cubic root of 91637201 is about 450.8415544285.

The spelling of 91637201 in words is "ninety-one million, six hundred thirty-seven thousand, two hundred one".