122879857 has 2 divisors, whose sum is σ = 122879858. Its totient is φ = 122879856.

The previous prime is 122879843. The next prime is 122879863. The reversal of 122879857 is 758978221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75325041 + 47554816 = 8679^2 + 6896^2 .

It is a cyclic number.

It is not a de Polignac number, because 122879857 - 2¹¹ = 122877809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122879857.

It is not a weakly prime, because it can be changed into another prime (122879807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61439928 + 61439929.

It is an arithmetic number, because the mean of its divisors is an integer number (61439929).

Almost surely, 2^122879857 is an apocalyptic number.

It is an amenable number.

122879857 is a deficient number, since it is larger than the sum of its proper divisors (1).

122879857 is an equidigital number, since it uses as much as digits as its factorization.

122879857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 49.

The square root of 122879857 is about 11085.1187183539. The cubic root of 122879857 is about 497.1570080991.

The spelling of 122879857 in words is "one hundred twenty-two million, eight hundred seventy-nine thousand, eight hundred fifty-seven".