12505891 has 2 divisors, whose sum is σ = 12505892. Its totient is φ = 12505890.

The previous prime is 12505879. The next prime is 12505903. The reversal of 12505891 is 19850521.

It is a balanced prime because it is at equal distance from previous prime (12505879) and next prime (12505903).

It is an emirp because it is prime and its reverse (19850521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12505891 - 2⁷ = 12505763 is a prime.

It is not a weakly prime, because it can be changed into another prime (12505811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6252945 + 6252946.

It is an arithmetic number, because the mean of its divisors is an integer number (6252946).

Almost surely, 2^12505891 is an apocalyptic number.

12505891 is a deficient number, since it is larger than the sum of its proper divisors (1).

12505891 is an equidigital number, since it uses as much as digits as its factorization.

12505891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 12505891 is about 3536.3669210081. The cubic root of 12505891 is about 232.1158940879.

The spelling of 12505891 in words is "twelve million, five hundred five thousand, eight hundred ninety-one".