671423121 has 32 divisors (see below), whose sum is σ = 1061456000. Its totient is φ = 418224384.

The previous prime is 671423117. The next prime is 671423131. The reversal of 671423121 is 121324176.

It is not a de Polignac number, because 671423121 - 2² = 671423117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (671423101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28485 + ... + 46413.

It is an arithmetic number, because the mean of its divisors is an integer number (33170500).

Almost surely, 2^671423121 is an apocalyptic number.

It is an amenable number.

671423121 is a deficient number, since it is larger than the sum of its proper divisors (390032879).

671423121 is a wasteful number, since it uses less digits than its factorization.

671423121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18030 (or 18024 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 671423121 is about 25911.8336093762. The cubic root of 671423121 is about 875.6531160815.

Adding to 671423121 its reverse (121324176), we get a palindrome (792747297).

The spelling of 671423121 in words is "six hundred seventy-one million, four hundred twenty-three thousand, one hundred twenty-one".