12155851 has 2 divisors, whose sum is σ = 12155852. Its totient is φ = 12155850.

The previous prime is 12155849. The next prime is 12155863. The reversal of 12155851 is 15855121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12155851 - 2¹ = 12155849 is a prime.

Together with 12155849, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12155821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077925 + 6077926.

It is an arithmetic number, because the mean of its divisors is an integer number (6077926).

Almost surely, 2^12155851 is an apocalyptic number.

12155851 is a deficient number, since it is larger than the sum of its proper divisors (1).

12155851 is an equidigital number, since it uses as much as digits as its factorization.

12155851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000, while the sum is 28.

The square root of 12155851 is about 3486.5242004036. The cubic root of 12155851 is about 229.9297264831.

The spelling of 12155851 in words is "twelve million, one hundred fifty-five thousand, eight hundred fifty-one".