7821069131 has 4 divisors (see below), whose sum is σ = 8090761200. Its totient is φ = 7551377064.

The previous prime is 7821069127. The next prime is 7821069133. The reversal of 7821069131 is 1319601287.

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

It is a cyclic number.

It is not a de Polignac number, because 7821069131 - 2² = 7821069127 is a prime.

It is a super-2 number, since 2×7821069131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7821069133) 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, 134845991 + ... + 134846048.

It is an arithmetic number, because the mean of its divisors is an integer number (2022690300).

Almost surely, 2^7821069131 is an apocalyptic number.

7821069131 is a deficient number, since it is larger than the sum of its proper divisors (269692069).

7821069131 is a wasteful number, since it uses less digits than its factorization.

7821069131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269692068.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 7821069131 is about 88436.8086884641. The cubic root of 7821069131 is about 1984.9765244132.

The spelling of 7821069131 in words is "seven billion, eight hundred twenty-one million, sixty-nine thousand, one hundred thirty-one".