18261145 has 32 divisors (see below), whose sum is σ = 27122688. Its totient is φ = 11516928.

The previous prime is 18261137. The next prime is 18261163. The reversal of 18261145 is 54116281.

It is a cyclic number.

It is not a de Polignac number, because 18261145 - 2³ = 18261137 is a prime.

It is a super-2 number, since 2×18261145² = 666938833422050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 27639 + ... + 28291.

It is an arithmetic number, because the mean of its divisors is an integer number (847584).

Almost surely, 2^18261145 is an apocalyptic number.

It is an amenable number.

18261145 is a deficient number, since it is larger than the sum of its proper divisors (8861543).

18261145 is a wasteful number, since it uses less digits than its factorization.

18261145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729.

The product of its digits is 1920, while the sum is 28.

The square root of 18261145 is about 4273.3060971571. The cubic root of 18261145 is about 263.3354545931.

The spelling of 18261145 in words is "eighteen million, two hundred sixty-one thousand, one hundred forty-five".