999090207025 has 9 divisors (see below), whose sum is σ = 1238878053921. Its totient is φ = 799268167440.

The previous prime is 999090207013. The next prime is 999090207083. The reversal of 999090207025 is 520702090999.

The square root of 999090207025 is 999545.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 317382376689 + 681707830336 = 563367^2 + 825656^2 .

It is not a de Polignac number, because 999090207025 - 2⁷ = 999090206897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4897771 + ... + 5097679.

Almost surely, 2^999090207025 is an apocalyptic number.

999090207025 is the 999545-th square number.

999090207025 is the 499773-rd centered octagonal number.

It is an amenable number.

999090207025 is a deficient number, since it is larger than the sum of its proper divisors (239787846896).

999090207025 is an frugal number, since it uses more digits than its factorization.

999090207025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399828 (or 199914 counting only the distinct ones).

The product of its (nonzero) digits is 918540, while the sum is 52.

The spelling of 999090207025 in words is "nine hundred ninety-nine billion, ninety million, two hundred seven thousand, twenty-five".