990518425 has 24 divisors (see below), whose sum is σ = 1334905880. Its totient is φ = 724723200.

The previous prime is 990518423. The next prime is 990518429. The reversal of 990518425 is 524815099.

It can be written as a sum of positive squares in 12 ways, for example, as 479215881 + 511302544 = 21891^2 + 22612^2 .

It is not a de Polignac number, because 990518425 - 2¹ = 990518423 is a prime.

It is a super-2 number, since 2×990518425² = 1962253500528961250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (990518423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21445 + ... + 49405.

Almost surely, 2^990518425 is an apocalyptic number.

It is an amenable number.

990518425 is a deficient number, since it is larger than the sum of its proper divisors (344387455).

990518425 is a wasteful number, since it uses less digits than its factorization.

990518425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28093 (or 28088 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 990518425 is about 31472.5026809118. The cubic root of 990518425 is about 996.8294331298.

The spelling of 990518425 in words is "nine hundred ninety million, five hundred eighteen thousand, four hundred twenty-five".