22501537 has 4 divisors (see below), whose sum is σ = 22615956. Its totient is φ = 22387120.

The previous prime is 22501517. The next prime is 22501543. The reversal of 22501537 is 73510522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18241441 + 4260096 = 4271^2 + 2064^2 .

It is a cyclic number.

It is not a de Polignac number, because 22501537 - 2¹¹ = 22499489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22501517) 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, 56914 + ... + 57307.

It is an arithmetic number, because the mean of its divisors is an integer number (5653989).

Almost surely, 2^22501537 is an apocalyptic number.

It is an amenable number.

22501537 is a deficient number, since it is larger than the sum of its proper divisors (114419).

22501537 is a wasteful number, since it uses less digits than its factorization.

22501537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114418.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 22501537 is about 4743.5785015113. The cubic root of 22501537 is about 282.3172368396.

The spelling of 22501537 in words is "twenty-two million, five hundred one thousand, five hundred thirty-seven".