18948961 has 4 divisors (see below), whose sum is σ = 19010992. Its totient is φ = 18886932.

The previous prime is 18948959. The next prime is 18948973. The reversal of 18948961 is 16984981.

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 18948961 - 2¹ = 18948959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18948991) 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, 30555 + ... + 31168.

It is an arithmetic number, because the mean of its divisors is an integer number (4752748).

Almost surely, 2^18948961 is an apocalyptic number.

It is an amenable number.

18948961 is a deficient number, since it is larger than the sum of its proper divisors (62031).

18948961 is an equidigital number, since it uses as much as digits as its factorization.

18948961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62030.

The product of its digits is 124416, while the sum is 46.

The square root of 18948961 is about 4353.0404316983. The cubic root of 18948961 is about 266.6010163042.

The spelling of 18948961 in words is "eighteen million, nine hundred forty-eight thousand, nine hundred sixty-one".