1557372869 has 4 divisors (see below), whose sum is σ = 1677170796. Its totient is φ = 1437574944.

The previous prime is 1557372863. The next prime is 1557372881. The reversal of 1557372869 is 9682737551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9682737551 = 191 ⋅50694961.

It can be written as a sum of positive squares in 2 ways, for example, as 606390625 + 950982244 = 24625^2 + 30838^2 .

It is not a de Polignac number, because 1557372869 - 2²⁸ = 1288937413 is a prime.

It is a super-2 number, since 2×1557372869² = 4850820506194582322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1557372869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557372863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59898944 + ... + 59898969.

It is an arithmetic number, because the mean of its divisors is an integer number (419292699).

Almost surely, 2^1557372869 is an apocalyptic number.

It is an amenable number.

1557372869 is a deficient number, since it is larger than the sum of its proper divisors (119797927).

1557372869 is a wasteful number, since it uses less digits than its factorization.

1557372869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119797926.

The product of its digits is 3175200, while the sum is 53.

The square root of 1557372869 is about 39463.5638152461. The cubic root of 1557372869 is about 1159.1265891202.

The spelling of 1557372869 in words is "one billion, five hundred fifty-seven million, three hundred seventy-two thousand, eight hundred sixty-nine".