91451 has 4 divisors (see below), whose sum is σ = 92400. Its totient is φ = 90504.

The previous prime is 91433. The next prime is 91453. The reversal of 91451 is 15419.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 15419 = 17 ⋅907.

It is a cyclic number.

It is not a de Polignac number, because 91451 - 2⁶ = 91387 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91451.

It is not an unprimeable number, because it can be changed into a prime (91453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311 + ... + 528.

It is an arithmetic number, because the mean of its divisors is an integer number (23100).

2⁹¹⁴⁵¹ is an apocalyptic number.

91451 is a deficient number, since it is larger than the sum of its proper divisors (949).

91451 is a wasteful number, since it uses less digits than its factorization.

91451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948.

The product of its digits is 180, while the sum is 20.

The square root of 91451 is about 302.4086638971. The cubic root of 91451 is about 45.0535986857.

It can be divided in two parts, 91 and 451, that multiplied together give a triangular number (41041 = T₂₈₆).

The spelling of 91451 in words is "ninety-one thousand, four hundred fifty-one".