469198921 has 3 divisors (see below), whose sum is σ = 469220583. Its totient is φ = 469177260.

The previous prime is 469198909. The next prime is 469198927. The reversal of 469198921 is 129891964.

It is a happy number.

The square root of 469198921 is 21661.

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., 147355321 + 321843600 = 12139^2 + 17940^2 .

It is not a de Polignac number, because 469198921 - 2⁵ = 469198889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (469198927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 10831 + ... + 32491.

It is an arithmetic number, because the mean of its divisors is an integer number (156406861).

Almost surely, 2^469198921 is an apocalyptic number.

469198921 is the 21661-st square number.

469198921 is the 10831-st centered octagonal number.

It is an amenable number.

469198921 is a deficient number, since it is larger than the sum of its proper divisors (21662).

469198921 is an frugal number, since it uses more digits than its factorization.

469198921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43322 (or 21661 counting only the distinct ones).

The product of its digits is 279936, while the sum is 49.

The cubic root of 469198921 is about 777.0560299306.

Multiplying 469198921 by its sum of digits (49), we get a square (22990747129 = 151627²).

The spelling of 469198921 in words is "four hundred sixty-nine million, one hundred ninety-eight thousand, nine hundred twenty-one".