18042961 has 4 divisors (see below), whose sum is σ = 18625024. Its totient is φ = 17460900.

The previous prime is 18042923. The next prime is 18042979. The reversal of 18042961 is 16924081.

It is a happy number.

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 18042961 - 2¹³ = 18034769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 582031 = 18042961 / (1 + 8 + 0 + 4 + 2 + 9 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18042161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290985 + ... + 291046.

It is an arithmetic number, because the mean of its divisors is an integer number (4656256).

Almost surely, 2^18042961 is an apocalyptic number.

It is an amenable number.

18042961 is a deficient number, since it is larger than the sum of its proper divisors (582063).

18042961 is an equidigital number, since it uses as much as digits as its factorization.

18042961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582062.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18042961 is about 4247.7006721284. The cubic root of 18042961 is about 262.2824731546.

The spelling of 18042961 in words is "eighteen million, forty-two thousand, nine hundred sixty-one".