22491643 has 2 divisors, whose sum is σ = 22491644. Its totient is φ = 22491642.

The previous prime is 22491613. The next prime is 22491653. The reversal of 22491643 is 34619422.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22491643 - 2¹³ = 22483451 is a prime.

It is not a weakly prime, because it can be changed into another prime (22491613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11245821 + 11245822.

It is an arithmetic number, because the mean of its divisors is an integer number (11245822).

Almost surely, 2^22491643 is an apocalyptic number.

22491643 is a deficient number, since it is larger than the sum of its proper divisors (1).

22491643 is an equidigital number, since it uses as much as digits as its factorization.

22491643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 22491643 is about 4742.5355032936. The cubic root of 22491643 is about 282.2758521668.

The spelling of 22491643 in words is "twenty-two million, four hundred ninety-one thousand, six hundred forty-three".