90723251 has 4 divisors (see below), whose sum is σ = 91266672. Its totient is φ = 90179832.

The previous prime is 90723221. The next prime is 90723257. The reversal of 90723251 is 15232709.

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

It is a cyclic number.

It is not a de Polignac number, because 90723251 - 2⁶ = 90723187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90723257) 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, 271460 + ... + 271793.

It is an arithmetic number, because the mean of its divisors is an integer number (22816668).

Almost surely, 2^90723251 is an apocalyptic number.

90723251 is a deficient number, since it is larger than the sum of its proper divisors (543421).

90723251 is a wasteful number, since it uses less digits than its factorization.

90723251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543420.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 90723251 is about 9524.8753797622. The cubic root of 90723251 is about 449.3377105244.

The spelling of 90723251 in words is "ninety million, seven hundred twenty-three thousand, two hundred fifty-one".