121387694559 has 16 divisors (see below), whose sum is σ = 167477500800. Its totient is φ = 78113049056.

The previous prime is 121387694539. The next prime is 121387694579. The reversal of 121387694559 is 955496783121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121387694539) and next prime (121387694579).

It is a cyclic number.

It is not a de Polignac number, because 121387694559 - 2²⁸ = 121119259103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121387694539) 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, 127672 + ... + 508994.

It is an arithmetic number, because the mean of its divisors is an integer number (10467343800).

Almost surely, 2^121387694559 is an apocalyptic number.

121387694559 is a deficient number, since it is larger than the sum of its proper divisors (46089806241).

121387694559 is a wasteful number, since it uses less digits than its factorization.

121387694559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385014.

The product of its digits is 16329600, while the sum is 60.

The spelling of 121387694559 in words is "one hundred twenty-one billion, three hundred eighty-seven million, six hundred ninety-four thousand, five hundred fifty-nine".