1557964249 has 4 divisors (see below), whose sum is σ = 1558235664. Its totient is φ = 1557692836.

The previous prime is 1557964237. The next prime is 1557964273. The reversal of 1557964249 is 9424697551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1557964249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1557964196 and 1557964205.

It is not an unprimeable number, because it can be changed into a prime (1557964229) 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, 126907 + ... + 138640.

It is an arithmetic number, because the mean of its divisors is an integer number (389558916).

Almost surely, 2^1557964249 is an apocalyptic number.

It is an amenable number.

1557964249 is a deficient number, since it is larger than the sum of its proper divisors (271415).

1557964249 is an equidigital number, since it uses as much as digits as its factorization.

1557964249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271414.

The product of its digits is 2721600, while the sum is 52.

The square root of 1557964249 is about 39471.0558384242. The cubic root of 1557964249 is about 1159.2732886353.

The spelling of 1557964249 in words is "one billion, five hundred fifty-seven million, nine hundred sixty-four thousand, two hundred forty-nine".