90220251 has 8 divisors (see below), whose sum is σ = 131229504. Its totient is φ = 54678920.

The previous prime is 90220243. The next prime is 90220259. The reversal of 90220251 is 15202209.

Added to its reverse (15202209) it gives a triangular number (105422460 = T₁₄₅₂₀).

It is an interprime number because it is at equal distance from previous prime (90220243) and next prime (90220259).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90220251 - 2³ = 90220243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90220259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1366941 + ... + 1367006.

It is an arithmetic number, because the mean of its divisors is an integer number (16403688).

Almost surely, 2^90220251 is an apocalyptic number.

90220251 is a deficient number, since it is larger than the sum of its proper divisors (41009253).

90220251 is a wasteful number, since it uses less digits than its factorization.

90220251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733961.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 90220251 is about 9498.4341341086. The cubic root of 90220251 is about 448.5057449529.

Adding to 90220251 its reverse (15202209), we get a triangular number (105422460 = T₁₄₅₂₀).

The spelling of 90220251 in words is "ninety million, two hundred twenty thousand, two hundred fifty-one".