172421969 has 4 divisors (see below), whose sum is σ = 177984000. Its totient is φ = 166859940.

The previous prime is 172421957. The next prime is 172421971. The reversal of 172421969 is 969124271.

172421969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-172421969 is a prime.

It is a super-2 number, since 2×172421969² = 59458670787673922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172421999) 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, 2780969 + ... + 2781030.

It is an arithmetic number, because the mean of its divisors is an integer number (44496000).

Almost surely, 2^172421969 is an apocalyptic number.

It is an amenable number.

172421969 is a deficient number, since it is larger than the sum of its proper divisors (5562031).

172421969 is an equidigital number, since it uses as much as digits as its factorization.

172421969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5562030.

The product of its digits is 54432, while the sum is 41.

The square root of 172421969 is about 13130.9546111469. The cubic root of 172421969 is about 556.5841911508.

The spelling of 172421969 in words is "one hundred seventy-two million, four hundred twenty-one thousand, nine hundred sixty-nine".