18999061 has 4 divisors (see below), whose sum is σ = 19144224. Its totient is φ = 18853900.

The previous prime is 18999037. The next prime is 18999091. The reversal of 18999061 is 16099981.

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 18999061 - 2⁷ = 18998933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18998999 and 18999017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18999091) 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, 72385 + ... + 72646.

It is an arithmetic number, because the mean of its divisors is an integer number (4786056).

Almost surely, 2^18999061 is an apocalyptic number.

It is an amenable number.

18999061 is a deficient number, since it is larger than the sum of its proper divisors (145163).

18999061 is a wasteful number, since it uses less digits than its factorization.

18999061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145162.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 18999061 is about 4358.7912315228. The cubic root of 18999061 is about 266.8357689592.

The spelling of 18999061 in words is "eighteen million, nine hundred ninety-nine thousand, sixty-one".