22145537 has 2 divisors, whose sum is σ = 22145538. Its totient is φ = 22145536.

The previous prime is 22145533. The next prime is 22145549. The reversal of 22145537 is 73554122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18671041 + 3474496 = 4321^2 + 1864^2 .

It is a cyclic number.

It is not a de Polignac number, because 22145537 - 2² = 22145533 is a prime.

It is not a weakly prime, because it can be changed into another prime (22145533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11072768 + 11072769.

It is an arithmetic number, because the mean of its divisors is an integer number (11072769).

Almost surely, 2^22145537 is an apocalyptic number.

It is an amenable number.

22145537 is a deficient number, since it is larger than the sum of its proper divisors (1).

22145537 is an equidigital number, since it uses as much as digits as its factorization.

22145537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 29.

The square root of 22145537 is about 4705.9044826686. The cubic root of 22145537 is about 280.8204549524.

Adding to 22145537 its reverse (73554122), we get a palindrome (95699659).

The spelling of 22145537 in words is "twenty-two million, one hundred forty-five thousand, five hundred thirty-seven".