22031661 has 8 divisors (see below), whose sum is σ = 29437344. Its totient is φ = 14656880.

The previous prime is 22031657. The next prime is 22031663. The reversal of 22031661 is 16613022.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22031661 - 2² = 22031657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22031663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6006 + ... + 8951.

It is an arithmetic number, because the mean of its divisors is an integer number (3679668).

Almost surely, 2^22031661 is an apocalyptic number.

It is an amenable number.

22031661 is a deficient number, since it is larger than the sum of its proper divisors (7405683).

22031661 is a wasteful number, since it uses less digits than its factorization.

22031661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15451.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 22031661 is about 4693.7896203388. The cubic root of 22031661 is about 280.3382858586.

Adding to 22031661 its reverse (16613022), we get a palindrome (38644683).

The spelling of 22031661 in words is "twenty-two million, thirty-one thousand, six hundred sixty-one".