990235025 has 24 divisors (see below), whose sum is σ = 1334523960. Its totient is φ = 724515840.

The previous prime is 990234997. The next prime is 990235049. The reversal of 990235025 is 520532099.

It is a Cunningham number, because it is equal to 31468²+1.

It can be written as a sum of positive squares in 12 ways, for example, as 77651344 + 912583681 = 8812^2 + 30209^2 .

It is not a de Polignac number, because 990235025 - 2⁶ = 990234961 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21449 + ... + 49401.

It is an arithmetic number, because the mean of its divisors is an integer number (55605165).

Almost surely, 2^990235025 is an apocalyptic number.

It is an amenable number.

990235025 is a deficient number, since it is larger than the sum of its proper divisors (344288935).

990235025 is a wasteful number, since it uses less digits than its factorization.

990235025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28085 (or 28080 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 990235025 is about 31468.0000158892. Note that the first 4 decimals coincide. The cubic root of 990235025 is about 996.7343555081.

The spelling of 990235025 in words is "nine hundred ninety million, two hundred thirty-five thousand, twenty-five".