90006251 has 4 divisors (see below), whose sum is σ = 90897504. Its totient is φ = 89115000.

The previous prime is 90006233. The next prime is 90006263. The reversal of 90006251 is 15260009.

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 90006251 - 2¹⁸ = 89744107 is a prime.

It is a super-2 number, since 2×90006251² = 16202250438150002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90006221) 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, 445475 + ... + 445676.

It is an arithmetic number, because the mean of its divisors is an integer number (22724376).

Almost surely, 2^90006251 is an apocalyptic number.

90006251 is a deficient number, since it is larger than the sum of its proper divisors (891253).

90006251 is a wasteful number, since it uses less digits than its factorization.

90006251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891252.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 90006251 is about 9487.1624314123. The cubic root of 90006251 is about 448.1508496974.

It can be divided in two parts, 9000 and 6251, that added together give a palindrome (15251).

The spelling of 90006251 in words is "ninety million, six thousand, two hundred fifty-one".