22161631 has 4 divisors (see below), whose sum is σ = 22760632. Its totient is φ = 21562632.

The previous prime is 22161617. The next prime is 22161647. The reversal of 22161631 is 13616122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22161631 - 2⁵ = 22161599 is a prime.

It is a super-2 number, since 2×22161631² = 982275777160322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299445 + ... + 299518.

It is an arithmetic number, because the mean of its divisors is an integer number (5690158).

Almost surely, 2^22161631 is an apocalyptic number.

22161631 is a deficient number, since it is larger than the sum of its proper divisors (599001).

22161631 is an equidigital number, since it uses as much as digits as its factorization.

22161631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599000.

The product of its digits is 432, while the sum is 22.

The square root of 22161631 is about 4707.6141515634. The cubic root of 22161631 is about 280.8884660977. Note that the first 3 decimals are identical.

Adding to 22161631 its reverse (13616122), we get a palindrome (35777753).

The spelling of 22161631 in words is "twenty-two million, one hundred sixty-one thousand, six hundred thirty-one".