121604815 has 4 divisors (see below), whose sum is σ = 145925784. Its totient is φ = 97283848.

The previous prime is 121604809. The next prime is 121604851. The reversal of 121604815 is 518406121.

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 121604815 - 2⁵ = 121604783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12160477 + ... + 12160486.

It is an arithmetic number, because the mean of its divisors is an integer number (36481446).

Almost surely, 2^121604815 is an apocalyptic number.

121604815 is a deficient number, since it is larger than the sum of its proper divisors (24320969).

121604815 is an equidigital number, since it uses as much as digits as its factorization.

121604815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24320968.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 121604815 is about 11027.4573225200. The cubic root of 121604815 is about 495.4314708860.

The spelling of 121604815 in words is "one hundred twenty-one million, six hundred four thousand, eight hundred fifteen".