122278257 has 12 divisors (see below), whose sum is σ = 178609860. Its totient is φ = 80602368.

The previous prime is 122278253. The next prime is 122278279. The reversal of 122278257 is 752872221.

It can be written as a sum of positive squares in 2 ways, for example, as 37564641 + 84713616 = 6129^2 + 9204^2 .

It is not a de Polignac number, because 122278257 - 2² = 122278253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122278253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75528 + ... + 77129.

It is an arithmetic number, because the mean of its divisors is an integer number (14884155).

Almost surely, 2^122278257 is an apocalyptic number.

It is an amenable number.

122278257 is a deficient number, since it is larger than the sum of its proper divisors (56331603).

122278257 is a wasteful number, since it uses less digits than its factorization.

122278257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152752 (or 152749 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 122278257 is about 11057.9499456274. The cubic root of 122278257 is about 496.3443468716.

The spelling of 122278257 in words is "one hundred twenty-two million, two hundred seventy-eight thousand, two hundred fifty-seven".