12387631897 has 2 divisors, whose sum is σ = 12387631898. Its totient is φ = 12387631896.

The previous prime is 12387631849. The next prime is 12387631901. The reversal of 12387631897 is 79813678321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10116537561 + 2271094336 = 100581^2 + 47656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12387631897 is a prime.

It is not a weakly prime, because it can be changed into another prime (12387631807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6193815948 + 6193815949.

It is an arithmetic number, because the mean of its divisors is an integer number (6193815949).

Almost surely, 2^12387631897 is an apocalyptic number.

It is an amenable number.

12387631897 is a deficient number, since it is larger than the sum of its proper divisors (1).

12387631897 is an equidigital number, since it uses as much as digits as its factorization.

12387631897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 55.

The spelling of 12387631897 in words is "twelve billion, three hundred eighty-seven million, six hundred thirty-one thousand, eight hundred ninety-seven".