12181951 has 2 divisors, whose sum is σ = 12181952. Its totient is φ = 12181950.

The previous prime is 12181931. The next prime is 12181957. The reversal of 12181951 is 15918121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12181951 - 2⁵ = 12181919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12181957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6090975 + 6090976.

It is an arithmetic number, because the mean of its divisors is an integer number (6090976).

Almost surely, 2^12181951 is an apocalyptic number.

12181951 is a deficient number, since it is larger than the sum of its proper divisors (1).

12181951 is an equidigital number, since it uses as much as digits as its factorization.

12181951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 28.

The square root of 12181951 is about 3490.2651761721. The cubic root of 12181951 is about 230.0941706375.

The spelling of 12181951 in words is "twelve million, one hundred eighty-one thousand, nine hundred fifty-one".