18010961 has 4 divisors (see below), whose sum is σ = 18020352. Its totient is φ = 18001572.

The previous prime is 18010919. The next prime is 18010963. The reversal of 18010961 is 16901081.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16901081 = 59 ⋅286459.

It is a cyclic number.

It is not a de Polignac number, because 18010961 - 2²² = 13816657 is a prime.

It is a super-2 number, since 2×18010961² = 648789432287042, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18010961.

It is not an unprimeable number, because it can be changed into a prime (18010963) 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 3 ways as a sum of consecutive naturals, for example, 665 + ... + 6038.

It is an arithmetic number, because the mean of its divisors is an integer number (4505088).

Almost surely, 2^18010961 is an apocalyptic number.

It is an amenable number.

18010961 is a deficient number, since it is larger than the sum of its proper divisors (9391).

18010961 is an equidigital number, since it uses as much as digits as its factorization.

18010961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9390.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 18010961 is about 4243.9322567638. The cubic root of 18010961 is about 262.1273248238.

The spelling of 18010961 in words is "eighteen million, ten thousand, nine hundred sixty-one".