22115831 has 2 divisors, whose sum is σ = 22115832. Its totient is φ = 22115830.

The previous prime is 22115783. The next prime is 22115839. The reversal of 22115831 is 13851122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22115831 - 2⁶ = 22115767 is a prime.

It is a super-2 number, since 2×22115831² = 978219961641122, 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 = 22115797 and 22115806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22115839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11057915 + 11057916.

It is an arithmetic number, because the mean of its divisors is an integer number (11057916).

Almost surely, 2^22115831 is an apocalyptic number.

22115831 is a deficient number, since it is larger than the sum of its proper divisors (1).

22115831 is an equidigital number, since it uses as much as digits as its factorization.

22115831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 23.

The square root of 22115831 is about 4702.7471758537. The cubic root of 22115831 is about 280.6948346792.

Adding to 22115831 its reverse (13851122), we get a palindrome (35966953).

The spelling of 22115831 in words is "twenty-two million, one hundred fifteen thousand, eight hundred thirty-one".