90200251 has 4 divisors (see below), whose sum is σ = 91043352. Its totient is φ = 89357152.

The previous prime is 90200233. The next prime is 90200261. The reversal of 90200251 is 15200209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15200209 = 19 ⋅800011.

It is a cyclic number.

It is not a de Polignac number, because 90200251 - 2⁵ = 90200219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90200261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421390 + ... + 421603.

It is an arithmetic number, because the mean of its divisors is an integer number (22760838).

Almost surely, 2^90200251 is an apocalyptic number.

90200251 is a deficient number, since it is larger than the sum of its proper divisors (843101).

90200251 is a wasteful number, since it uses less digits than its factorization.

90200251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843100.

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

The square root of 90200251 is about 9497.3812706451. The cubic root of 90200251 is about 448.4726009610.

The spelling of 90200251 in words is "ninety million, two hundred thousand, two hundred fifty-one".