1813307057 has 4 divisors (see below), whose sum is σ = 1919972196. Its totient is φ = 1706641920.

The previous prime is 1813307011. The next prime is 1813307071. The reversal of 1813307057 is 7507033181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1489882801 + 323424256 = 38599^2 + 17984^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813307057 - 2¹⁸ = 1813044913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1813307257) 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, 53332544 + ... + 53332577.

It is an arithmetic number, because the mean of its divisors is an integer number (479993049).

Almost surely, 2^1813307057 is an apocalyptic number.

1813307057 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1813307057 is a deficient number, since it is larger than the sum of its proper divisors (106665139).

1813307057 is a wasteful number, since it uses less digits than its factorization.

1813307057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106665138.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 1813307057 is about 42582.9432637060. The cubic root of 1813307057 is about 1219.4306796750.

The spelling of 1813307057 in words is "one billion, eight hundred thirteen million, three hundred seven thousand, fifty-seven".