983163921 has 4 divisors (see below), whose sum is σ = 1310885232. Its totient is φ = 655442612.

The previous prime is 983163913. The next prime is 983163931. The reversal of 983163921 is 129361389.

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 983163921 - 2³ = 983163913 is a prime.

It is a super-2 number, since 2×983163921² = 1933222591112188482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (983163931) 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, 163860651 + ... + 163860656.

It is an arithmetic number, because the mean of its divisors is an integer number (327721308).

Almost surely, 2^983163921 is an apocalyptic number.

It is an amenable number.

983163921 is a deficient number, since it is larger than the sum of its proper divisors (327721311).

983163921 is a wasteful number, since it uses less digits than its factorization.

983163921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327721310.

The product of its digits is 69984, while the sum is 42.

The square root of 983163921 is about 31355.4448381776. Note that the first 3 decimals coincide. The cubic root of 983163921 is about 994.3561808962.

The spelling of 983163921 in words is "nine hundred eighty-three million, one hundred sixty-three thousand, nine hundred twenty-one".