90251389 has 4 divisors (see below), whose sum is σ = 90270400. Its totient is φ = 90232380.

The previous prime is 90251347. The next prime is 90251411. The reversal of 90251389 is 98315209.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 90251389 - 2¹⁵ = 90218621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90251339) 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, 4294 + ... + 14104.

It is an arithmetic number, because the mean of its divisors is an integer number (22567600).

Almost surely, 2^90251389 is an apocalyptic number.

It is an amenable number.

90251389 is a deficient number, since it is larger than the sum of its proper divisors (19011).

90251389 is an equidigital number, since it uses as much as digits as its factorization.

90251389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19010.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 90251389 is about 9500.0731049819. The cubic root of 90251389 is about 448.5573370858.

The spelling of 90251389 in words is "ninety million, two hundred fifty-one thousand, three hundred eighty-nine".