22491709 has 16 divisors (see below), whose sum is σ = 24330240. Its totient is φ = 20749680.

The previous prime is 22491683. The next prime is 22491713. The reversal of 22491709 is 90719422.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22491709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22491719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62472 + ... + 62830.

It is an arithmetic number, because the mean of its divisors is an integer number (1520640).

Almost surely, 2^22491709 is an apocalyptic number.

It is an amenable number.

22491709 is a deficient number, since it is larger than the sum of its proper divisors (1838531).

22491709 is a wasteful number, since it uses less digits than its factorization.

22491709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 22491709 is about 4742.5424615917. The cubic root of 22491709 is about 282.2761282721.

The spelling of 22491709 in words is "twenty-two million, four hundred ninety-one thousand, seven hundred nine".