1572245779 has 4 divisors (see below), whose sum is σ = 1693187776. Its totient is φ = 1451303784.

The previous prime is 1572245729. The next prime is 1572245783. The reversal of 1572245779 is 9775422751.

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 1572245779 - 2¹⁷ = 1572114707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1572245729) 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, 60470979 + ... + 60471004.

It is an arithmetic number, because the mean of its divisors is an integer number (423296944).

Almost surely, 2^1572245779 is an apocalyptic number.

1572245779 is a deficient number, since it is larger than the sum of its proper divisors (120941997).

1572245779 is a wasteful number, since it uses less digits than its factorization.

1572245779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120941996.

The product of its digits is 1234800, while the sum is 49.

The square root of 1572245779 is about 39651.5545596891. The cubic root of 1572245779 is about 1162.8047909949.

The spelling of 1572245779 in words is "one billion, five hundred seventy-two million, two hundred forty-five thousand, seven hundred seventy-nine".