12661251 has 16 divisors (see below), whose sum is σ = 17525760. Its totient is φ = 8124480.

The previous prime is 12661241. The next prime is 12661261. The reversal of 12661251 is 15216621.

It is an interprime number because it is at equal distance from previous prime (12661241) and next prime (12661261).

It is not a de Polignac number, because 12661251 - 2⁷ = 12661123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12661211) 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, 9066 + ... + 10368.

It is an arithmetic number, because the mean of its divisors is an integer number (1095360).

Almost surely, 2^12661251 is an apocalyptic number.

12661251 is a deficient number, since it is larger than the sum of its proper divisors (4864509).

12661251 is a wasteful number, since it uses less digits than its factorization.

12661251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426.

The product of its digits is 720, while the sum is 24.

The square root of 12661251 is about 3558.2651671847. The cubic root of 12661251 is about 233.0731287583.

Adding to 12661251 its reverse (15216621), we get a palindrome (27877872).

The spelling of 12661251 in words is "twelve million, six hundred sixty-one thousand, two hundred fifty-one".