1557422609 has 8 divisors (see below), whose sum is σ = 1692276480. Its totient is φ = 1427857200.

The previous prime is 1557422599. The next prime is 1557422677. The reversal of 1557422609 is 9062247551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1557422609 - 2⁴ = 1557422593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1557422689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1321502 + ... + 1322679.

It is an arithmetic number, because the mean of its divisors is an integer number (211534560).

Almost surely, 2^1557422609 is an apocalyptic number.

1557422609 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1557422609 is a deficient number, since it is larger than the sum of its proper divisors (134853871).

1557422609 is a wasteful number, since it uses less digits than its factorization.

1557422609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644231.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 1557422609 is about 39464.1940117874. The cubic root of 1557422609 is about 1159.1389292056.

It can be divided in two parts, 15574 and 22609, that added together give a palindrome (38183).

The spelling of 1557422609 in words is "one billion, five hundred fifty-seven million, four hundred twenty-two thousand, six hundred nine".