122865991 has 2 divisors, whose sum is σ = 122865992. Its totient is φ = 122865990.

The previous prime is 122865961. The next prime is 122866033. The reversal of 122865991 is 199568221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 122865991 - 2¹³ = 122857799 is a prime.

It is a super-3 number, since 3×122865991³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122865901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61432995 + 61432996.

It is an arithmetic number, because the mean of its divisors is an integer number (61432996).

Almost surely, 2^122865991 is an apocalyptic number.

122865991 is a deficient number, since it is larger than the sum of its proper divisors (1).

122865991 is an equidigital number, since it uses as much as digits as its factorization.

122865991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 43.

The square root of 122865991 is about 11084.4932676239. The cubic root of 122865991 is about 497.1383073439.

The spelling of 122865991 in words is "one hundred twenty-two million, eight hundred sixty-five thousand, nine hundred ninety-one".