671572121 has 8 divisors (see below), whose sum is σ = 732859488. Its totient is φ = 610324000.

The previous prime is 671572117. The next prime is 671572123. The reversal of 671572121 is 121275176.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 671572121 - 2² = 671572117 is a prime.

It is a super-2 number, since 2×671572121² = 902018227408877282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671572123) 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 7 ways as a sum of consecutive naturals, for example, 34826 + ... + 50556.

It is an arithmetic number, because the mean of its divisors is an integer number (91607436).

Almost surely, 2^671572121 is an apocalyptic number.

It is an amenable number.

671572121 is a deficient number, since it is larger than the sum of its proper divisors (61287367).

671572121 is a wasteful number, since it uses less digits than its factorization.

671572121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19623.

The product of its digits is 5880, while the sum is 32.

The square root of 671572121 is about 25914.7085841226. The cubic root of 671572121 is about 875.7178853058.

It can be divided in two parts, 6715721 and 21, that multiplied together give a palindrome (141030141).

The spelling of 671572121 in words is "six hundred seventy-one million, five hundred seventy-two thousand, one hundred twenty-one".