22031001 has 8 divisors (see below), whose sum is σ = 32638560. Its totient is φ = 14687316.

The previous prime is 22030993. The next prime is 22031003. The reversal of 22031001 is 10013022.

22031001 = 481² + 482² + ... + 561².

It is a happy number.

It is not a de Polignac number, because 22031001 - 2³ = 22030993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (22031003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407955 + ... + 408008.

It is an arithmetic number, because the mean of its divisors is an integer number (4079820).

Almost surely, 2^22031001 is an apocalyptic number.

It is an amenable number.

22031001 is a deficient number, since it is larger than the sum of its proper divisors (10607559).

22031001 is an equidigital number, since it uses as much as digits as its factorization.

22031001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815972 (or 815966 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 22031001 is about 4693.7193141474. The cubic root of 22031001 is about 280.3354864764.

Adding to 22031001 its reverse (10013022), we get a palindrome (32044023).

The spelling of 22031001 in words is "twenty-two million, thirty-one thousand, one".