122686649 has 2 divisors, whose sum is σ = 122686650. Its totient is φ = 122686648.

The previous prime is 122686633. The next prime is 122686657. The reversal of 122686649 is 946686221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107226025 + 15460624 = 10355^2 + 3932^2 .

It is a cyclic number.

It is not a de Polignac number, because 122686649 - 2⁴ = 122686633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (122686549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61343324 + 61343325.

It is an arithmetic number, because the mean of its divisors is an integer number (61343325).

Almost surely, 2^122686649 is an apocalyptic number.

It is an amenable number.

122686649 is a deficient number, since it is larger than the sum of its proper divisors (1).

122686649 is an equidigital number, since it uses as much as digits as its factorization.

122686649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 44.

The square root of 122686649 is about 11076.4005434979. The cubic root of 122686649 is about 496.8963060310.

The spelling of 122686649 in words is "one hundred twenty-two million, six hundred eighty-six thousand, six hundred forty-nine".