618195921 has 16 divisors (see below), whose sum is σ = 943002624. Its totient is φ = 352883664.

The previous prime is 618195883. The next prime is 618195947. The reversal of 618195921 is 129591816.

It is not a de Polignac number, because 618195921 - 2¹⁴ = 618179537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (618195961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5670 + ... + 35616.

It is an arithmetic number, because the mean of its divisors is an integer number (58937664).

Almost surely, 2^618195921 is an apocalyptic number.

It is an amenable number.

618195921 is a deficient number, since it is larger than the sum of its proper divisors (324806703).

618195921 is a wasteful number, since it uses less digits than its factorization.

618195921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30940.

The product of its digits is 38880, while the sum is 42.

The square root of 618195921 is about 24863.5460262610. The cubic root of 618195921 is about 851.8740294593.

The spelling of 618195921 in words is "six hundred eighteen million, one hundred ninety-five thousand, nine hundred twenty-one".