1557644089 has 9 divisors (see below), whose sum is σ = 1586049231. Its totient is φ = 1529740920.

The previous prime is 1557644087. The next prime is 1557644107. The reversal of 1557644089 is 9804467551.

It is a happy number.

The square root of 1557644089 is 39467.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 50651689 + 1506992400 = 7117^2 + 38820^2 .

It is not a de Polignac number, because 1557644089 - 2¹ = 1557644087 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (1557644087) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2407164 + ... + 2407810.

Almost surely, 2^1557644089 is an apocalyptic number.

1557644089 is the 39467-th square number.

1557644089 is the 19734-th centered octagonal number.

It is an amenable number.

1557644089 is a deficient number, since it is larger than the sum of its proper divisors (28405142).

1557644089 is an frugal number, since it uses more digits than its factorization.

1557644089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416 (or 708 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 49.

The cubic root of 1557644089 is about 1159.1938733849.

Multiplying 1557644089 by its sum of digits (49), we get a square (76324560361 = 276269²).

The spelling of 1557644089 in words is "one billion, five hundred fifty-seven million, six hundred forty-four thousand, eighty-nine".