121515860 has 12 divisors (see below), whose sum is σ = 255183348. Its totient is φ = 48606336.

The previous prime is 121515857. The next prime is 121515913. The reversal of 121515860 is 68515121.

It can be written as a sum of positive squares in 2 ways, for example, as 16289296 + 105226564 = 4036^2 + 10258^2 .

It is a super-2 number, since 2×121515860² = 29532208463079200, which contains 22 as substring.

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, 3037877 + ... + 3037916.

It is an arithmetic number, because the mean of its divisors is an integer number (21265279).

Almost surely, 2^121515860 is an apocalyptic number.

121515860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121515860 is an abundant number, since it is smaller than the sum of its proper divisors (133667488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121515860 is a wasteful number, since it uses less digits than its factorization.

121515860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6075802 (or 6075800 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 29.

The square root of 121515860 is about 11023.4232432580. The cubic root of 121515860 is about 495.3106372468.

The spelling of 121515860 in words is "one hundred twenty-one million, five hundred fifteen thousand, eight hundred sixty".