147889921 has 3 divisors (see below), whose sum is σ = 147902083. Its totient is φ = 147877760.

The previous prime is 147889877. The next prime is 147889967. The reversal of 147889921 is 129988741.

The square root of 147889921 is 12161.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 34680321 + 113209600 = 5889^2 + 10640^2 .

It is not a de Polignac number, because 147889921 - 2²⁷ = 13672193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (147889991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6081 + ... + 18241.

Almost surely, 2^147889921 is an apocalyptic number.

147889921 is the 12161-st square number.

147889921 is the 6081-st centered octagonal number.

It is an amenable number.

147889921 is a deficient number, since it is larger than the sum of its proper divisors (12162).

147889921 is an frugal number, since it uses more digits than its factorization.

147889921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24322 (or 12161 counting only the distinct ones).

The product of its digits is 290304, while the sum is 49.

The cubic root of 147889921 is about 528.8260726596.

Multiplying 147889921 by its sum of digits (49), we get a square (7246606129 = 85127²).

The spelling of 147889921 in words is "one hundred forty-seven million, eight hundred eighty-nine thousand, nine hundred twenty-one".