18501481 has 4 divisors (see below), whose sum is σ = 18931792. Its totient is φ = 18071172.

The previous prime is 18501467. The next prime is 18501529. The reversal of 18501481 is 18410581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18501481 - 2¹¹ = 18499433 is a prime.

It is a super-2 number, since 2×18501481² = 684609598386722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18501781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215091 + ... + 215176.

It is an arithmetic number, because the mean of its divisors is an integer number (4732948).

Almost surely, 2^18501481 is an apocalyptic number.

It is an amenable number.

18501481 is a deficient number, since it is larger than the sum of its proper divisors (430311).

18501481 is an equidigital number, since it uses as much as digits as its factorization.

18501481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430310.

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 18501481 is about 4301.3347928288. The cubic root of 18501481 is about 264.4856809751.

The spelling of 18501481 in words is "eighteen million, five hundred one thousand, four hundred eighty-one".