91551271 has 8 divisors (see below), whose sum is σ = 106063904. Its totient is φ = 77397120.

The previous prime is 91551269. The next prime is 91551323. The reversal of 91551271 is 17215519.

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 91551271 - 2¹ = 91551269 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 (91551221) 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, 89070 + ... + 90091.

It is an arithmetic number, because the mean of its divisors is an integer number (13257988).

Almost surely, 2^91551271 is an apocalyptic number.

91551271 is a deficient number, since it is larger than the sum of its proper divisors (14512633).

91551271 is a wasteful number, since it uses less digits than its factorization.

91551271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179241.

The product of its digits is 3150, while the sum is 31.

The square root of 91551271 is about 9568.2428376374. The cubic root of 91551271 is about 450.7005893691.

The spelling of 91551271 in words is "ninety-one million, five hundred fifty-one thousand, two hundred seventy-one".