1557196049 has 4 divisors (see below), whose sum is σ = 1558115364. Its totient is φ = 1556276736.

The previous prime is 1557196037. The next prime is 1557196051. The reversal of 1557196049 is 9406917551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9406917551 = 607 ⋅15497393.

It can be written as a sum of positive squares in 2 ways, for example, as 1208813824 + 348382225 = 34768^2 + 18665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1557196049 - 2²⁴ = 1540418833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1557195994 and 1557196012.

It is not an unprimeable number, because it can be changed into a prime (1557196019) 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, 457112 + ... + 460505.

It is an arithmetic number, because the mean of its divisors is an integer number (389528841).

Almost surely, 2^1557196049 is an apocalyptic number.

It is an amenable number.

1557196049 is a deficient number, since it is larger than the sum of its proper divisors (919315).

1557196049 is an equidigital number, since it uses as much as digits as its factorization.

1557196049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919314.

The product of its (nonzero) digits is 340200, while the sum is 47.

The square root of 1557196049 is about 39461.3234572790. The cubic root of 1557196049 is about 1159.0827194032.

The spelling of 1557196049 in words is "one billion, five hundred fifty-seven million, one hundred ninety-six thousand, forty-nine".