91537601 has 4 divisors (see below), whose sum is σ = 94694100. Its totient is φ = 88381104.

The previous prime is 91537597. The next prime is 91537603. The reversal of 91537601 is 10673519.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18879025 + 72658576 = 4345^2 + 8524^2 .

It is a cyclic number.

It is not a de Polignac number, because 91537601 - 2² = 91537597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91537603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1578206 + ... + 1578263.

It is an arithmetic number, because the mean of its divisors is an integer number (23673525).

Almost surely, 2^91537601 is an apocalyptic number.

It is an amenable number.

91537601 is a deficient number, since it is larger than the sum of its proper divisors (3156499).

91537601 is a wasteful number, since it uses less digits than its factorization.

91537601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3156498.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 91537601 is about 9567.5284687321. The cubic root of 91537601 is about 450.6781560970.

The spelling of 91537601 in words is "ninety-one million, five hundred thirty-seven thousand, six hundred one".