90812451 has 4 divisors (see below), whose sum is σ = 121083272. Its totient is φ = 60541632.

The previous prime is 90812399. The next prime is 90812459. The reversal of 90812451 is 15421809.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 90812451 - 2⁹ = 90811939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90812459) 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, 15135406 + ... + 15135411.

It is an arithmetic number, because the mean of its divisors is an integer number (30270818).

Almost surely, 2^90812451 is an apocalyptic number.

90812451 is a deficient number, since it is larger than the sum of its proper divisors (30270821).

90812451 is a wasteful number, since it uses less digits than its factorization.

90812451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30270820.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 90812451 is about 9529.5567053248. The cubic root of 90812451 is about 449.4849267177.

The spelling of 90812451 in words is "ninety million, eight hundred twelve thousand, four hundred fifty-one".