12157897 has 2 divisors, whose sum is σ = 12157898. Its totient is φ = 12157896.

The previous prime is 12157889. The next prime is 12157909. The reversal of 12157897 is 79875121.

12157897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8173881 + 3984016 = 2859^2 + 1996^2 .

It is an emirp because it is prime and its reverse (79875121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12157897 - 2³ = 12157889 is a prime.

It is not a weakly prime, because it can be changed into another prime (12157877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6078948 + 6078949.

It is an arithmetic number, because the mean of its divisors is an integer number (6078949).

Almost surely, 2^12157897 is an apocalyptic number.

It is an amenable number.

12157897 is a deficient number, since it is larger than the sum of its proper divisors (1).

12157897 is an equidigital number, since it uses as much as digits as its factorization.

12157897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 40.

The square root of 12157897 is about 3486.8176034889. The cubic root of 12157897 is about 229.9426258907.

The spelling of 12157897 in words is "twelve million, one hundred fifty-seven thousand, eight hundred ninety-seven".