1557249445 has 16 divisors (see below), whose sum is σ = 1906165872. Its totient is φ = 1220876800.

The previous prime is 1557249439. The next prime is 1557249457. The reversal of 1557249445 is 5449427551.

It is a Cunningham number, because it is equal to 39462²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 1557249444 = 1^2 + 39462^2 .

It is not a de Polignac number, because 1557249445 - 2³ = 1557249437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1557249395 and 1557249404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265545 + ... + 271345.

It is an arithmetic number, because the mean of its divisors is an integer number (119135367).

Almost surely, 2^1557249445 is an apocalyptic number.

It is an amenable number.

1557249445 is a deficient number, since it is larger than the sum of its proper divisors (348916427).

1557249445 is a wasteful number, since it uses less digits than its factorization.

1557249445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6872.

The product of its digits is 1008000, while the sum is 46.

The square root of 1557249445 is about 39462.0000126704. Note that the first 4 decimals coincide. The cubic root of 1557249445 is about 1159.0959675046.

The spelling of 1557249445 in words is "one billion, five hundred fifty-seven million, two hundred forty-nine thousand, four hundred forty-five".