121552515 has 64 divisors (see below), whose sum is σ = 248371200. Its totient is φ = 55251072.

The previous prime is 121552507. The next prime is 121552553. The reversal of 121552515 is 515255121.

121552515 is a `hidden beast` number, since 121 + 5 + 525 + 15 = 666.

It is not a de Polignac number, because 121552515 - 2³ = 121552507 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 63 ways as a sum of consecutive naturals, for example, 276666 + ... + 277104.

It is an arithmetic number, because the mean of its divisors is an integer number (3880800).

Almost surely, 2^121552515 is an apocalyptic number.

121552515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121552515 is an abundant number, since it is smaller than the sum of its proper divisors (126818685).

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

121552515 is a wasteful number, since it uses less digits than its factorization.

121552515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753 (or 747 counting only the distinct ones).

The product of its digits is 2500, while the sum is 27.

The square root of 121552515 is about 11025.0857139525. The cubic root of 121552515 is about 495.3604353724.

The spelling of 121552515 in words is "one hundred twenty-one million, five hundred fifty-two thousand, five hundred fifteen".