122491009 has 2 divisors, whose sum is σ = 122491010. Its totient is φ = 122491008.

The previous prime is 122490959. The next prime is 122491073. The reversal of 122491009 is 900194221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121616784 + 874225 = 11028^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 122491009 - 2²⁵ = 88936577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (122491079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61245504 + 61245505.

It is an arithmetic number, because the mean of its divisors is an integer number (61245505).

Almost surely, 2^122491009 is an apocalyptic number.

It is an amenable number.

122491009 is a deficient number, since it is larger than the sum of its proper divisors (1).

122491009 is an equidigital number, since it uses as much as digits as its factorization.

122491009 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 122491009 is about 11067.5656311585. The cubic root of 122491009 is about 496.6320433401.

The spelling of 122491009 in words is "one hundred twenty-two million, four hundred ninety-one thousand, nine".