609657121 has 2 divisors, whose sum is σ = 609657122. Its totient is φ = 609657120.

The previous prime is 609657079. The next prime is 609657127. The reversal of 609657121 is 121756906.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 348382225 + 261274896 = 18665^2 + 16164^2 .

It is a cyclic number.

It is not a de Polignac number, because 609657121 - 2¹³ = 609648929 is a prime.

It is a super-3 number, since 3×609657121³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (609657127) 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 as a sum of consecutive naturals, namely, 304828560 + 304828561.

It is an arithmetic number, because the mean of its divisors is an integer number (304828561).

Almost surely, 2^609657121 is an apocalyptic number.

It is an amenable number.

609657121 is a deficient number, since it is larger than the sum of its proper divisors (1).

609657121 is an equidigital number, since it uses as much as digits as its factorization.

609657121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 609657121 is about 24691.2357122927. The cubic root of 609657121 is about 847.9336757082.

It can be divided in two parts, 60965 and 7121, that added together give a palindrome (68086).

The spelling of 609657121 in words is "six hundred nine million, six hundred fifty-seven thousand, one hundred twenty-one".