1557741493 has 16 divisors (see below), whose sum is σ = 2026561536. Its totient is φ = 1161048240.

The previous prime is 1557741481. The next prime is 1557741503. The reversal of 1557741493 is 3941477551.

It is not a de Polignac number, because 1557741493 - 2⁵ = 1557741461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557741463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438021 + ... + 441562.

It is an arithmetic number, because the mean of its divisors is an integer number (126660096).

Almost surely, 2^1557741493 is an apocalyptic number.

It is an amenable number.

1557741493 is a deficient number, since it is larger than the sum of its proper divisors (468820043).

1557741493 is a wasteful number, since it uses less digits than its factorization.

1557741493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879624.

The product of its digits is 529200, while the sum is 46.

The square root of 1557741493 is about 39468.2339736655. The cubic root of 1557741493 is about 1159.2180354656.

The spelling of 1557741493 in words is "one billion, five hundred fifty-seven million, seven hundred forty-one thousand, four hundred ninety-three".