91395557 has 8 divisors (see below), whose sum is σ = 100375200. Its totient is φ = 82527760.

The previous prime is 91395547. The next prime is 91395569. The reversal of 91395557 is 75559319.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91395557 - 2⁴ = 91395541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91395517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26243 + ... + 29520.

It is an arithmetic number, because the mean of its divisors is an integer number (12546900).

Almost surely, 2^91395557 is an apocalyptic number.

It is an amenable number.

91395557 is a deficient number, since it is larger than the sum of its proper divisors (8979643).

91395557 is a wasteful number, since it uses less digits than its factorization.

91395557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55923.

The product of its digits is 212625, while the sum is 44.

The square root of 91395557 is about 9560.1023530086. The cubic root of 91395557 is about 450.4449212720. Note that the first 3 decimals are identical.

The spelling of 91395557 in words is "ninety-one million, three hundred ninety-five thousand, five hundred fifty-seven".