1245544409 has 16 divisors (see below), whose sum is σ = 1283040000. Its totient is φ = 1208739840.

The previous prime is 1245544393. The next prime is 1245544439. The reversal of 1245544409 is 9044455421.

It is a cyclic number.

It is not a de Polignac number, because 1245544409 - 2⁴ = 1245544393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245544439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2773817 + ... + 2774265.

It is an arithmetic number, because the mean of its divisors is an integer number (80190000).

Almost surely, 2^1245544409 is an apocalyptic number.

It is an amenable number.

1245544409 is a deficient number, since it is larger than the sum of its proper divisors (37495591).

1245544409 is an equidigital number, since it uses as much as digits as its factorization.

1245544409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048.

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 1245544409 is about 35292.2712360653. The cubic root of 1245544409 is about 1075.9359172944.

The spelling of 1245544409 in words is "one billion, two hundred forty-five million, five hundred forty-four thousand, four hundred nine".