1245553879 has 4 divisors (see below), whose sum is σ = 1245908584. Its totient is φ = 1245199176.

The previous prime is 1245553877. The next prime is 1245553921. The reversal of 1245553879 is 9783555421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1245553879 - 2¹ = 1245553877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245553877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172032 + ... + 179125.

It is an arithmetic number, because the mean of its divisors is an integer number (311477146).

Almost surely, 2^1245553879 is an apocalyptic number.

1245553879 is a deficient number, since it is larger than the sum of its proper divisors (354705).

1245553879 is an equidigital number, since it uses as much as digits as its factorization.

1245553879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354704.

The product of its digits is 1512000, while the sum is 49.

The square root of 1245553879 is about 35292.4054011624. The cubic root of 1245553879 is about 1075.9386441039.

The spelling of 1245553879 in words is "one billion, two hundred forty-five million, five hundred fifty-three thousand, eight hundred seventy-nine".