91251 has 6 divisors (see below), whose sum is σ = 131820. Its totient is φ = 60828.

The previous prime is 91249. The next prime is 91253. The reversal of 91251 is 15219.

It is an interprime number because it is at equal distance from previous prime (91249) and next prime (91253).

It is not a de Polignac number, because 91251 - 2¹ = 91249 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91251.

It is not an unprimeable number, because it can be changed into a prime (91253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5061 + ... + 5078.

It is an arithmetic number, because the mean of its divisors is an integer number (21970).

2⁹¹²⁵¹ is an apocalyptic number.

91251 is a deficient number, since it is larger than the sum of its proper divisors (40569).

91251 is a wasteful number, since it uses less digits than its factorization.

91251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10145 (or 10142 counting only the distinct ones).

The product of its digits is 90, while the sum is 18.

The square root of 91251 is about 302.0778045471. The cubic root of 91251 is about 45.0207311886.

The spelling of 91251 in words is "ninety-one thousand, two hundred fifty-one".