722222131 has 2 divisors, whose sum is σ = 722222132. Its totient is φ = 722222130.

The previous prime is 722222117. The next prime is 722222173. The reversal of 722222131 is 131222227.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-722222131 is a prime.

It is a super-2 number, since 2×722222131² = 1043209613012362322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (722222231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361111065 + 361111066.

It is an arithmetic number, because the mean of its divisors is an integer number (361111066).

Almost surely, 2^722222131 is an apocalyptic number.

722222131 is a deficient number, since it is larger than the sum of its proper divisors (1).

722222131 is an equidigital number, since it uses as much as digits as its factorization.

722222131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 22.

The square root of 722222131 is about 26874.1907971198. The cubic root of 722222131 is about 897.2020642400.

Adding to 722222131 its reverse (131222227), we get a palindrome (853444358).

The spelling of 722222131 in words is "seven hundred twenty-two million, two hundred twenty-two thousand, one hundred thirty-one".