122457689 has 2 divisors, whose sum is σ = 122457690. Its totient is φ = 122457688.

The previous prime is 122457667. The next prime is 122457697. The reversal of 122457689 is 986754221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118635664 + 3822025 = 10892^2 + 1955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122457689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (122457649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61228844 + 61228845.

It is an arithmetic number, because the mean of its divisors is an integer number (61228845).

Almost surely, 2^122457689 is an apocalyptic number.

It is an amenable number.

122457689 is a deficient number, since it is larger than the sum of its proper divisors (1).

122457689 is an equidigital number, since it uses as much as digits as its factorization.

122457689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 122457689 is about 11066.0602293680. The cubic root of 122457689 is about 496.5870079793.

The spelling of 122457689 in words is "one hundred twenty-two million, four hundred fifty-seven thousand, six hundred eighty-nine".