2057731321 has 8 divisors (see below), whose sum is σ = 2077767560. Its totient is φ = 2037716352.

The previous prime is 2057731309. The next prime is 2057731339. The reversal of 2057731321 is 1231377502.

It can be written as a sum of positive squares in 4 ways, for example, as 98783721 + 1958947600 = 9939^2 + 44260^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2057731321 - 2²⁷ = 1923513593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2057731381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245821 + ... + 254053.

It is an arithmetic number, because the mean of its divisors is an integer number (259720945).

Almost surely, 2^2057731321 is an apocalyptic number.

It is an amenable number.

2057731321 is a deficient number, since it is larger than the sum of its proper divisors (20036239).

2057731321 is a wasteful number, since it uses less digits than its factorization.

2057731321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10635.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 2057731321 is about 45362.2235014996. The cubic root of 2057731321 is about 1271.9290585889.

The spelling of 2057731321 in words is "two billion, fifty-seven million, seven hundred thirty-one thousand, three hundred twenty-one".