12851861 has 4 divisors (see below), whose sum is σ = 14020224. Its totient is φ = 11683500.

The previous prime is 12851851. The next prime is 12851897. The reversal of 12851861 is 16815821.

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.

It is a cyclic number.

It is not a de Polignac number, because 12851861 - 2¹⁴ = 12835477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12851831) 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, 584165 + ... + 584186.

It is an arithmetic number, because the mean of its divisors is an integer number (3505056).

Almost surely, 2^12851861 is an apocalyptic number.

12851861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12851861 is a deficient number, since it is larger than the sum of its proper divisors (1168363).

12851861 is a wasteful number, since it uses less digits than its factorization.

12851861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168362.

The product of its digits is 3840, while the sum is 32.

The square root of 12851861 is about 3584.9492325555. The cubic root of 12851861 is about 234.2369151891.

The spelling of 12851861 in words is "twelve million, eight hundred fifty-one thousand, eight hundred sixty-one".