121516251 has 16 divisors (see below), whose sum is σ = 170465568. Its totient is φ = 76896000.

The previous prime is 121516217. The next prime is 121516259. The reversal of 121516251 is 152615121.

It is not a de Polignac number, because 121516251 - 2¹⁰ = 121515227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121516259) 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, 8800 + ... + 17901.

It is an arithmetic number, because the mean of its divisors is an integer number (10654098).

Almost surely, 2^121516251 is an apocalyptic number.

121516251 is a deficient number, since it is larger than the sum of its proper divisors (48949317).

121516251 is a wasteful number, since it uses less digits than its factorization.

121516251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26782.

The product of its digits is 600, while the sum is 24.

The square root of 121516251 is about 11023.4409782064. The cubic root of 121516251 is about 495.3111684978.

The spelling of 121516251 in words is "one hundred twenty-one million, five hundred sixteen thousand, two hundred fifty-one".