12187497609 has 45 divisors (see below), whose sum is σ = 20564350989. Its totient is φ = 6955011000.

The previous prime is 12187497601. The next prime is 12187497653. The reversal of 12187497609 is 90679478121.

The square root of 12187497609 is 110397.

It is a perfect power (a square), and thus also a powerful number.

12187497609 is a `hidden beast` number, since 1 + 21 + 8 + 7 + 4 + 9 + 7 + 609 = 666.

It is not a de Polignac number, because 12187497609 - 2³ = 12187497601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12187497601) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 16227984 + ... + 16228734.

Almost surely, 2^12187497609 is an apocalyptic number.

12187497609 is the 110397-th square number.

12187497609 is the 55199-th centered octagonal number.

It is an amenable number.

12187497609 is a deficient number, since it is larger than the sum of its proper divisors (8376853380).

12187497609 is an frugal number, since it uses more digits than its factorization.

12187497609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

It can be divided in two parts, 12187 and 497609, that added together give a square (509796 = 714²).

The spelling of 12187497609 in words is "twelve billion, one hundred eighty-seven million, four hundred ninety-seven thousand, six hundred nine".