91885497 has 16 divisors (see below), whose sum is σ = 133816320. Its totient is φ = 55619600.

The previous prime is 91885477. The next prime is 91885513. The reversal of 91885497 is 79458819.

It is a cyclic number.

It is not a de Polignac number, because 91885497 - 2¹² = 91881401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91885447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42472 + ... + 44582.

It is an arithmetic number, because the mean of its divisors is an integer number (8363520).

Almost surely, 2^91885497 is an apocalyptic number.

It is an amenable number.

91885497 is a deficient number, since it is larger than the sum of its proper divisors (41930823).

91885497 is a wasteful number, since it uses less digits than its factorization.

91885497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444.

The product of its digits is 725760, while the sum is 51.

The square root of 91885497 is about 9585.6923067664. The cubic root of 91885497 is about 451.2483804803.

It can be divided in two parts, 91 and 885497, that added together give a palindrome (885588).

The spelling of 91885497 in words is "ninety-one million, eight hundred eighty-five thousand, four hundred ninety-seven".