121315569 has 16 divisors (see below), whose sum is σ = 165240000. Its totient is φ = 79142336.

The previous prime is 121315567. The next prime is 121315577. The reversal of 121315569 is 965513121.

It is a cyclic number.

It is not a de Polignac number, because 121315569 - 2¹ = 121315567 is a prime.

It is a super-2 number, since 2×121315569² = 29434934563587522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121315567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80182 + ... + 81680.

It is an arithmetic number, because the mean of its divisors is an integer number (10327500).

Almost surely, 2^121315569 is an apocalyptic number.

It is an amenable number.

121315569 is a deficient number, since it is larger than the sum of its proper divisors (43924431).

121315569 is a wasteful number, since it uses less digits than its factorization.

121315569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064.

The product of its digits is 8100, while the sum is 33.

The square root of 121315569 is about 11014.3347052829. The cubic root of 121315569 is about 495.0383522983.

The spelling of 121315569 in words is "one hundred twenty-one million, three hundred fifteen thousand, five hundred sixty-nine".