18117025 has 12 divisors (see below), whose sum is σ = 23240700. Its totient is φ = 13993280.

The previous prime is 18117023. The next prime is 18117041. The reversal of 18117025 is 52071181.

It can be written as a sum of positive squares in 6 ways, for example, as 952576 + 17164449 = 976^2 + 4143^2 .

It is not a de Polignac number, because 18117025 - 2¹ = 18117023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (18117023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11770 + ... + 13219.

It is an arithmetic number, because the mean of its divisors is an integer number (1936725).

Almost surely, 2^18117025 is an apocalyptic number.

It is an amenable number.

18117025 is a deficient number, since it is larger than the sum of its proper divisors (5123675).

18117025 is a wasteful number, since it uses less digits than its factorization.

18117025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25028 (or 25023 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 18117025 is about 4256.4098721810. The cubic root of 18117025 is about 262.6408616617.

It can be divided in two parts, 1811 and 7025, that added together give a square (8836 = 94²).

The spelling of 18117025 in words is "eighteen million, one hundred seventeen thousand, twenty-five".