121606515 has 40 divisors (see below), whose sum is σ = 218967408. Its totient is φ = 64566720.

The previous prime is 121606501. The next prime is 121606523. The reversal of 121606515 is 515606121.

It is a happy number.

121606515 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 0 + 651 + 5 = 666.

It is not a de Polignac number, because 121606515 - 2⁸ = 121606259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 114085 + ... + 115145.

Almost surely, 2^121606515 is an apocalyptic number.

121606515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121606515 is a deficient number, since it is larger than the sum of its proper divisors (97360893).

121606515 is a wasteful number, since it uses less digits than its factorization.

121606515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361 (or 1352 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 121606515 is about 11027.5344025761. The cubic root of 121606515 is about 495.4337795379.

The spelling of 121606515 in words is "one hundred twenty-one million, six hundred six thousand, five hundred fifteen".