121555499 has 8 divisors (see below), whose sum is σ = 131639760. Its totient is φ = 111576096.

The previous prime is 121555463. The next prime is 121555513. The reversal of 121555499 is 994555121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121555499 - 2²⁰ = 120506923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121555429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23792 + ... + 28445.

It is an arithmetic number, because the mean of its divisors is an integer number (16454970).

Almost surely, 2^121555499 is an apocalyptic number.

121555499 is a deficient number, since it is larger than the sum of its proper divisors (10084261).

121555499 is a wasteful number, since it uses less digits than its factorization.

121555499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52429.

The product of its digits is 81000, while the sum is 41.

The square root of 121555499 is about 11025.2210408681. The cubic root of 121555499 is about 495.3644888836.

The spelling of 121555499 in words is "one hundred twenty-one million, five hundred fifty-five thousand, four hundred ninety-nine".