491800025 has 12 divisors (see below), whose sum is σ = 610439724. Its totient is φ = 393048000.

The previous prime is 491800019. The next prime is 491800039. The reversal of 491800025 is 520008194.

It can be written as a sum of positive squares in 6 ways, for example, as 2859481 + 488940544 = 1691^2 + 22112^2 .

It is not a de Polignac number, because 491800025 - 2⁸ = 491799769 is a prime.

It is a Duffinian number.

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, 17255 + ... + 35795.

It is an arithmetic number, because the mean of its divisors is an integer number (50869977).

Almost surely, 2^491800025 is an apocalyptic number.

It is an amenable number.

491800025 is a deficient number, since it is larger than the sum of its proper divisors (118639699).

491800025 is a wasteful number, since it uses less digits than its factorization.

491800025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19612 (or 19607 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 491800025 is about 22176.5647700450. The cubic root of 491800025 is about 789.3377053503.

The spelling of 491800025 in words is "four hundred ninety-one million, eight hundred thousand, twenty-five".