6615121 has 4 divisors (see below), whose sum is σ = 6828544. Its totient is φ = 6401700.

The previous prime is 6615113. The next prime is 6615127. The reversal of 6615121 is 1215166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1215166 = 2 ⋅607583.

It is a cyclic number.

It is not a de Polignac number, because 6615121 - 2³ = 6615113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6615092 and 6615101.

It is not an unprimeable number, because it can be changed into a prime (6615127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106665 + ... + 106726.

It is an arithmetic number, because the mean of its divisors is an integer number (1707136).

Almost surely, 2^6615121 is an apocalyptic number.

It is an amenable number.

6615121 is a deficient number, since it is larger than the sum of its proper divisors (213423).

6615121 is a wasteful number, since it uses less digits than its factorization.

6615121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213422.

The product of its digits is 360, while the sum is 22.

The square root of 6615121 is about 2571.9877526925. The cubic root of 6615121 is about 187.7208869382.

The spelling of 6615121 in words is "six million, six hundred fifteen thousand, one hundred twenty-one".