122029991 has 2 divisors, whose sum is σ = 122029992. Its totient is φ = 122029990.

The previous prime is 122029987. The next prime is 122029993. The reversal of 122029991 is 199920221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 122029991 - 2² = 122029987 is a prime.

Together with 122029993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122029993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61014995 + 61014996.

It is an arithmetic number, because the mean of its divisors is an integer number (61014996).

Almost surely, 2^122029991 is an apocalyptic number.

122029991 is a deficient number, since it is larger than the sum of its proper divisors (1).

122029991 is an equidigital number, since it uses as much as digits as its factorization.

122029991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 122029991 is about 11046.7185625415. The cubic root of 122029991 is about 496.0082039378.

The spelling of 122029991 in words is "one hundred twenty-two million, twenty-nine thousand, nine hundred ninety-one".