222115631 has 2 divisors, whose sum is σ = 222115632. Its totient is φ = 222115630.

The previous prime is 222115613. The next prime is 222115639. The reversal of 222115631 is 136511222.

Together with previous prime (222115613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222115631 is a prime.

It is a super-2 number, since 2×222115631² = 98670707069056322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 222115597 and 222115606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222115639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111057815 + 111057816.

It is an arithmetic number, because the mean of its divisors is an integer number (111057816).

Almost surely, 2^222115631 is an apocalyptic number.

222115631 is a deficient number, since it is larger than the sum of its proper divisors (1).

222115631 is an equidigital number, since it uses as much as digits as its factorization.

222115631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 222115631 is about 14903.5442428974. The cubic root of 222115631 is about 605.6100042366.

Adding to 222115631 its reverse (136511222), we get a palindrome (358626853).

The spelling of 222115631 in words is "two hundred twenty-two million, one hundred fifteen thousand, six hundred thirty-one".