22236537 has 4 divisors (see below), whose sum is σ = 29648720. Its totient is φ = 14824356.

The previous prime is 22236509. The next prime is 22236541. The reversal of 22236537 is 73563222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22236537 - 2¹⁰ = 22235513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22236037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3706087 + ... + 3706092.

It is an arithmetic number, because the mean of its divisors is an integer number (7412180).

Almost surely, 2^22236537 is an apocalyptic number.

It is an amenable number.

22236537 is a deficient number, since it is larger than the sum of its proper divisors (7412183).

22236537 is an equidigital number, since it uses as much as digits as its factorization.

22236537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7412182.

The product of its digits is 15120, while the sum is 30.

The square root of 22236537 is about 4715.5632749439. The cubic root of 22236537 is about 281.2045765655.

Adding to 22236537 its reverse (73563222), we get a palindrome (95799759).

The spelling of 22236537 in words is "twenty-two million, two hundred thirty-six thousand, five hundred thirty-seven".