990517825 has 12 divisors (see below), whose sum is σ = 1339900848. Its totient is φ = 720376400.

The previous prime is 990517813. The next prime is 990517837. The reversal of 990517825 is 528715099.

It is an interprime number because it is at equal distance from previous prime (990517813) and next prime (990517837).

It is not a de Polignac number, because 990517825 - 2²¹ = 988420673 is a prime.

It is a super-2 number, since 2×990517825² = 1962251123285461250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1800667 + ... + 1801216.

It is an arithmetic number, because the mean of its divisors is an integer number (111658404).

Almost surely, 2^990517825 is an apocalyptic number.

It is an amenable number.

990517825 is a deficient number, since it is larger than the sum of its proper divisors (349383023).

990517825 is a wasteful number, since it uses less digits than its factorization.

990517825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601904 (or 3601899 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 46.

The square root of 990517825 is about 31472.4931487799. The cubic root of 990517825 is about 996.8292318554.

It can be divided in two parts, 9905 and 17825, that added together give a triangular number (27730 = T₂₃₅).

The spelling of 990517825 in words is "nine hundred ninety million, five hundred seventeen thousand, eight hundred twenty-five".