91600551 has 60 divisors (see below), whose sum is σ = 161091112. Its totient is φ = 52009776.

The previous prime is 91600547. The next prime is 91600633. The reversal of 91600551 is 15500619.

91600551 is a `hidden beast` number, since 9 + 1 + 600 + 5 + 51 = 666.

It is not a de Polignac number, because 91600551 - 2² = 91600547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91600541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 583365 + ... + 583521.

Almost surely, 2^91600551 is an apocalyptic number.

91600551 is a deficient number, since it is larger than the sum of its proper divisors (69490561).

91600551 is an frugal number, since it uses more digits than its factorization.

91600551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 91600551 is about 9570.8176766669. The cubic root of 91600551 is about 450.7814422102.

The spelling of 91600551 in words is "ninety-one million, six hundred thousand, five hundred fifty-one".