122004991 has 2 divisors, whose sum is σ = 122004992. Its totient is φ = 122004990.

The previous prime is 122004913. The next prime is 122005003. The reversal of 122004991 is 199400221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 122004991 - 2¹⁵ = 121972223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122004901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61002495 + 61002496.

It is an arithmetic number, because the mean of its divisors is an integer number (61002496).

Almost surely, 2^122004991 is an apocalyptic number.

122004991 is a deficient number, since it is larger than the sum of its proper divisors (1).

122004991 is an equidigital number, since it uses as much as digits as its factorization.

122004991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 122004991 is about 11045.5869468308. The cubic root of 122004991 is about 495.9743296093.

It can be divided in two parts, 12 and 2004991, that added together give a triangular number (2005003 = T₂₀₀₂).

The spelling of 122004991 in words is "one hundred twenty-two million, four thousand, nine hundred ninety-one".