12578121 has 6 divisors (see below), whose sum is σ = 18168410. Its totient is φ = 8385408.

The previous prime is 12578117. The next prime is 12578129. The reversal of 12578121 is 12187521.

It can be written as a sum of positive squares in only one way, i.e., 11696400 + 881721 = 3420^2 + 939^2 .

It is not a de Polignac number, because 12578121 - 2² = 12578117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12578129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 698776 + ... + 698793.

Almost surely, 2^12578121 is an apocalyptic number.

It is an amenable number.

12578121 is a deficient number, since it is larger than the sum of its proper divisors (5590289).

12578121 is a wasteful number, since it uses less digits than its factorization.

12578121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397575 (or 1397572 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 12578121 is about 3546.5646758518. The cubic root of 12578121 is about 232.5619120587.

The spelling of 12578121 in words is "twelve million, five hundred seventy-eight thousand, one hundred twenty-one".