22145993 has 2 divisors, whose sum is σ = 22145994. Its totient is φ = 22145992.

The previous prime is 22145983. The next prime is 22146023. The reversal of 22145993 is 39954122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21418384 + 727609 = 4628^2 + 853^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22145993 is a prime.

It is not a weakly prime, because it can be changed into another prime (22145923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11072996 + 11072997.

It is an arithmetic number, because the mean of its divisors is an integer number (11072997).

Almost surely, 2^22145993 is an apocalyptic number.

It is an amenable number.

22145993 is a deficient number, since it is larger than the sum of its proper divisors (1).

22145993 is an equidigital number, since it uses as much as digits as its factorization.

22145993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 22145993 is about 4705.9529321913. The cubic root of 22145993 is about 280.8223824024.

The spelling of 22145993 in words is "twenty-two million, one hundred forty-five thousand, nine hundred ninety-three".