7811849057 has 4 divisors (see below), whose sum is σ = 7835029956. Its totient is φ = 7788668160.

The previous prime is 7811848997. The next prime is 7811849113. The reversal of 7811849057 is 7509481187.

7811849057 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 2238330721 + 5573518336 = 47311^2 + 74656^2 .

It is a cyclic number.

It is not a de Polignac number, because 7811849057 - 2⁸ = 7811848801 is a prime.

It is a super-2 number, since 2×7811849057² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7811848996 and 7811849014.

It is not an unprimeable number, because it can be changed into a prime (7811843057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11589944 + ... + 11590617.

It is an arithmetic number, because the mean of its divisors is an integer number (1958757489).

Almost surely, 2^7811849057 is an apocalyptic number.

It is an amenable number.

7811849057 is a deficient number, since it is larger than the sum of its proper divisors (23180899).

7811849057 is a wasteful number, since it uses less digits than its factorization.

7811849057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23180898.

The product of its (nonzero) digits is 564480, while the sum is 50.

The square root of 7811849057 is about 88384.6652819368. The cubic root of 7811849057 is about 1984.1962036908.

The spelling of 7811849057 in words is "seven billion, eight hundred eleven million, eight hundred forty-nine thousand, fifty-seven".