12451649 has 4 divisors (see below), whose sum is σ = 14230464. Its totient is φ = 10672836.

The previous prime is 12451627. The next prime is 12451657. The reversal of 12451649 is 94615421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12451649 - 2¹⁶ = 12386113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12451619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 889397 + ... + 889410.

It is an arithmetic number, because the mean of its divisors is an integer number (3557616).

Almost surely, 2^12451649 is an apocalyptic number.

It is an amenable number.

12451649 is a deficient number, since it is larger than the sum of its proper divisors (1778815).

12451649 is an equidigital number, since it uses as much as digits as its factorization.

12451649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778814.

The product of its digits is 8640, while the sum is 32.

The square root of 12451649 is about 3528.6894167665. The cubic root of 12451649 is about 231.7798210802.

The spelling of 12451649 in words is "twelve million, four hundred fifty-one thousand, six hundred forty-nine".