18061537 has 8 divisors (see below), whose sum is σ = 19568360. Its totient is φ = 16670160.

The previous prime is 18061529. The next prime is 18061543. The reversal of 18061537 is 73516081.

It can be written as a sum of positive squares in 4 ways, for example, as 1731856 + 16329681 = 1316^2 + 4041^2 .

It is not a de Polignac number, because 18061537 - 2³ = 18061529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18061499 and 18061508.

It is not an unprimeable number, because it can be changed into a prime (18061567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1914 + ... + 6307.

It is an arithmetic number, because the mean of its divisors is an integer number (2446045).

Almost surely, 2^18061537 is an apocalyptic number.

It is an amenable number.

18061537 is a deficient number, since it is larger than the sum of its proper divisors (1506823).

18061537 is an frugal number, since it uses more digits than its factorization.

18061537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8260 (or 8234 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 18061537 is about 4249.8867043722. The cubic root of 18061537 is about 262.3724526235.

The spelling of 18061537 in words is "eighteen million, sixty-one thousand, five hundred thirty-seven".