1818596025 has 27 divisors (see below), whose sum is σ = 3258453679. Its totient is φ = 969576720.

The previous prime is 1818596023. The next prime is 1818596027. The reversal of 1818596025 is 5206958181.

It is a happy number.

The square root of 1818596025 is 42645.

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

It is an interprime number because it is at equal distance from previous prime (1818596023) and next prime (1818596027).

It can be written as a sum of positive squares in only one way, i.e., 654694569 + 1163901456 = 25587^2 + 34116^2 .

It is not a de Polignac number, because 1818596025 - 2¹ = 1818596023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1818596023) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 638254 + ... + 641096.

Almost surely, 2^1818596025 is an apocalyptic number.

1818596025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1818596025 is the 42645-th square number.

1818596025 is the 21323-rd centered octagonal number.

It is an amenable number.

1818596025 is a deficient number, since it is larger than the sum of its proper divisors (1439857654).

1818596025 is an frugal number, since it uses more digits than its factorization.

1818596025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5702 (or 2851 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The cubic root of 1818596025 is about 1220.6151213646.

The spelling of 1818596025 in words is "one billion, eight hundred eighteen million, five hundred ninety-six thousand, twenty-five".