121590919 has 4 divisors (see below), whose sum is σ = 128743344. Its totient is φ = 114438496.

The previous prime is 121590907. The next prime is 121590923. The reversal of 121590919 is 919095121.

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 121590919 - 2¹⁷ = 121459847 is a prime.

It is a super-2 number, since 2×121590919² = 29568703166529122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121590929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3576187 + ... + 3576220.

It is an arithmetic number, because the mean of its divisors is an integer number (32185836).

Almost surely, 2^121590919 is an apocalyptic number.

121590919 is a deficient number, since it is larger than the sum of its proper divisors (7152425).

121590919 is an equidigital number, since it uses as much as digits as its factorization.

121590919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7152424.

The product of its (nonzero) digits is 7290, while the sum is 37.

The square root of 121590919 is about 11026.8272408703. The cubic root of 121590919 is about 495.4125988866.

The spelling of 121590919 in words is "one hundred twenty-one million, five hundred ninety thousand, nine hundred nineteen".