90047251 has 18 divisors (see below), whose sum is σ = 110617620. Its totient is φ = 72885960.

The previous prime is 90047239. The next prime is 90047261. The reversal of 90047251 is 15274009.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-90047251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90047201) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 289386 + ... + 289696.

Almost surely, 2^90047251 is an apocalyptic number.

90047251 is a deficient number, since it is larger than the sum of its proper divisors (20570369).

90047251 is an equidigital number, since it uses as much as digits as its factorization.

90047251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 90047251 is about 9489.3230000880. The cubic root of 90047251 is about 448.2188871777.

The spelling of 90047251 in words is "ninety million, forty-seven thousand, two hundred fifty-one".