7800221131 has 2 divisors, whose sum is σ = 7800221132. Its totient is φ = 7800221130.

The previous prime is 7800221053. The next prime is 7800221171. The reversal of 7800221131 is 1311220087.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7800221131 - 2¹¹ = 7800219083 is a prime.

It is a super-2 number, since 2×7800221131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7800221096 and 7800221105.

It is not a weakly prime, because it can be changed into another prime (7800221171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3900110565 + 3900110566.

It is an arithmetic number, because the mean of its divisors is an integer number (3900110566).

Almost surely, 2^7800221131 is an apocalyptic number.

7800221131 is a deficient number, since it is larger than the sum of its proper divisors (1).

7800221131 is an equidigital number, since it uses as much as digits as its factorization.

7800221131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 7800221131 is about 88318.8605621698. The cubic root of 7800221131 is about 1983.2112237574.

The spelling of 7800221131 in words is "seven billion, eight hundred million, two hundred twenty-one thousand, one hundred thirty-one".