657342121 has 4 divisors (see below), whose sum is σ = 657425152. Its totient is φ = 657259092.

The previous prime is 657342113. The next prime is 657342157. The reversal of 657342121 is 121243756.

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 not a de Polignac number, because 657342121 - 2³ = 657342113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (657642121) 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 3 ways as a sum of consecutive naturals, for example, 28221 + ... + 45946.

It is an arithmetic number, because the mean of its divisors is an integer number (164356288).

Almost surely, 2^657342121 is an apocalyptic number.

It is an amenable number.

657342121 is a deficient number, since it is larger than the sum of its proper divisors (83031).

657342121 is an equidigital number, since it uses as much as digits as its factorization.

657342121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83030.

The product of its digits is 10080, while the sum is 31.

The square root of 657342121 is about 25638.6840730955. The cubic root of 657342121 is about 869.4884564925.

Adding to 657342121 its reverse (121243756), we get a palindrome (778585877).

The spelling of 657342121 in words is "six hundred fifty-seven million, three hundred forty-two thousand, one hundred twenty-one".