7220138131 has 2 divisors, whose sum is σ = 7220138132. Its totient is φ = 7220138130.

The previous prime is 7220138117. The next prime is 7220138143. The reversal of 7220138131 is 1318310227.

7220138131 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7220138131 - 2¹¹ = 7220136083 is a prime.

It is a super-2 number, since 2×7220138131² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7220138131.

It is not a weakly prime, because it can be changed into another prime (7220138161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610069065 + 3610069066.

It is an arithmetic number, because the mean of its divisors is an integer number (3610069066).

Almost surely, 2^7220138131 is an apocalyptic number.

7220138131 is a deficient number, since it is larger than the sum of its proper divisors (1).

7220138131 is an equidigital number, since it uses as much as digits as its factorization.

7220138131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 7220138131 is about 84971.3959576986. The cubic root of 7220138131 is about 1932.7773851895. Note that the first 3 decimals are identical.

Adding to 7220138131 its reverse (1318310227), we get a palindrome (8538448358).

The spelling of 7220138131 in words is "seven billion, two hundred twenty million, one hundred thirty-eight thousand, one hundred thirty-one".