121161615 has 16 divisors (see below), whose sum is σ = 194265216. Its totient is φ = 64484000.

The previous prime is 121161587. The next prime is 121161619. The reversal of 121161615 is 516161121.

It is not a de Polignac number, because 121161615 - 2¹⁰ = 121160591 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121161619) 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, 861 + ... + 15590.

It is an arithmetic number, because the mean of its divisors is an integer number (12141576).

Almost surely, 2^121161615 is an apocalyptic number.

121161615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121161615 is a deficient number, since it is larger than the sum of its proper divisors (73103601).

121161615 is a wasteful number, since it uses less digits than its factorization.

121161615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16950.

The product of its digits is 360, while the sum is 24.

The square root of 121161615 is about 11007.3436850132. The cubic root of 121161615 is about 494.8288562515.

It can be divided in two parts, 12116 and 1615, that added together give a palindrome (13731).

The spelling of 121161615 in words is "one hundred twenty-one million, one hundred sixty-one thousand, six hundred fifteen".