121490239 has 4 divisors (see below), whose sum is σ = 130835656. Its totient is φ = 112144824.

The previous prime is 121490227. The next prime is 121490273. The reversal of 121490239 is 932094121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121490239 - 2¹⁷ = 121359167 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121490239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121490539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4672689 + ... + 4672714.

It is an arithmetic number, because the mean of its divisors is an integer number (32708914).

Almost surely, 2^121490239 is an apocalyptic number.

121490239 is a deficient number, since it is larger than the sum of its proper divisors (9345417).

121490239 is an equidigital number, since it uses as much as digits as its factorization.

121490239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9345416.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 121490239 is about 11022.2610656798. The cubic root of 121490239 is about 495.2758235585.

The spelling of 121490239 in words is "one hundred twenty-one million, four hundred ninety thousand, two hundred thirty-nine".