90451 has 4 divisors (see below), whose sum is σ = 93600. Its totient is φ = 87304.

The previous prime is 90439. The next prime is 90469. The reversal of 90451 is 15409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15409 = 19 ⋅811.

It is a cyclic number.

It is not a de Polignac number, because 90451 - 2⁹ = 89939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90401) 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, 1531 + ... + 1588.

It is an arithmetic number, because the mean of its divisors is an integer number (23400).

2⁹⁰⁴⁵¹ is an apocalyptic number.

90451 is the 135-th centered decagonal number.

90451 is a deficient number, since it is larger than the sum of its proper divisors (3149).

90451 is a wasteful number, since it uses less digits than its factorization.

90451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3148.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 90451 is about 300.7507273474. The cubic root of 90451 is about 44.8887788322. Note that the first 3 decimals are identical.

The spelling of 90451 in words is "ninety thousand, four hundred fifty-one".