121615 has 8 divisors (see below), whose sum is σ = 157248. Its totient is φ = 89760.

The previous prime is 121609. The next prime is 121621. The reversal of 121615 is 516121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121609) and next prime (121621).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121615 - 2³ = 121607 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 871 + ... + 1000.

It is an arithmetic number, because the mean of its divisors is an integer number (19656).

2¹²¹⁶¹⁵ is an apocalyptic number.

121615 is a deficient number, since it is larger than the sum of its proper divisors (35633).

121615 is a wasteful number, since it uses less digits than its factorization.

121615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889.

The product of its digits is 60, while the sum is 16.

The square root of 121615 is about 348.7334225451. The cubic root of 121615 is about 49.5445302105.

Adding to 121615 its reverse (516121), we get a palindrome (637736).

The spelling of 121615 in words is "one hundred twenty-one thousand, six hundred fifteen".