122720887 has 2 divisors, whose sum is σ = 122720888. Its totient is φ = 122720886.

The previous prime is 122720881. The next prime is 122720903. The reversal of 122720887 is 788027221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 122720887 - 2³ = 122720879 is a prime.

It is a super-2 number, since 2×122720887² = 30120832212133538, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122720881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61360443 + 61360444.

It is an arithmetic number, because the mean of its divisors is an integer number (61360444).

Almost surely, 2^122720887 is an apocalyptic number.

122720887 is a deficient number, since it is larger than the sum of its proper divisors (1).

122720887 is an equidigital number, since it uses as much as digits as its factorization.

122720887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 122720887 is about 11077.9459738708. The cubic root of 122720887 is about 496.9425244624.

The spelling of 122720887 in words is "one hundred twenty-two million, seven hundred twenty thousand, eight hundred eighty-seven".