18071525 has 12 divisors (see below), whose sum is σ = 22610532. Its totient is φ = 14327040.

The previous prime is 18071509. The next prime is 18071549. The reversal of 18071525 is 52517081.

It can be written as a sum of positive squares in 6 ways, for example, as 9597604 + 8473921 = 3098^2 + 2911^2 .

It is not a de Polignac number, because 18071525 - 2⁴ = 18071509 is a prime.

It is a Duffinian number.

It is a congruent 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, 374 + ... + 6023.

It is an arithmetic number, because the mean of its divisors is an integer number (1884211).

Almost surely, 2^18071525 is an apocalyptic number.

It is an amenable number.

18071525 is a deficient number, since it is larger than the sum of its proper divisors (4539007).

18071525 is a wasteful number, since it uses less digits than its factorization.

18071525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6520 (or 6515 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 18071525 is about 4251.0616321103. The cubic root of 18071525 is about 262.4208075549.

The spelling of 18071525 in words is "eighteen million, seventy-one thousand, five hundred twenty-five".