1257143353 has 24 divisors (see below), whose sum is σ = 1385816040. Its totient is φ = 1139723520.

The previous prime is 1257143347. The next prime is 1257143441. The reversal of 1257143353 is 3533417521.

It can be written as a sum of positive squares in 4 ways, for example, as 32353344 + 1224790009 = 5688^2 + 34997^2 .

It is not a de Polignac number, because 1257143353 - 2⁹ = 1257142841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1257143333) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15913168 + ... + 15913246.

It is an arithmetic number, because the mean of its divisors is an integer number (57742335).

Almost surely, 2^1257143353 is an apocalyptic number.

It is an amenable number.

1257143353 is a deficient number, since it is larger than the sum of its proper divisors (128672687).

1257143353 is an frugal number, since it uses more digits than its factorization.

1257143353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 137 counting only the distinct ones).

The product of its digits is 37800, while the sum is 34.

The square root of 1257143353 is about 35456.2174096448. The cubic root of 1257143353 is about 1079.2654335653.

The spelling of 1257143353 in words is "one billion, two hundred fifty-seven million, one hundred forty-three thousand, three hundred fifty-three".