22501541 has 4 divisors (see below), whose sum is σ = 22583052. Its totient is φ = 22420032.

The previous prime is 22501517. The next prime is 22501543. The reversal of 22501541 is 14510522.

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 8288641 + 14212900 = 2879^2 + 3770^2 .

It is a cyclic number.

It is not a de Polignac number, because 22501541 - 2¹⁴ = 22485157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22501543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40340 + ... + 40893.

It is an arithmetic number, because the mean of its divisors is an integer number (5645763).

Almost surely, 2^22501541 is an apocalyptic number.

It is an amenable number.

22501541 is a deficient number, since it is larger than the sum of its proper divisors (81511).

22501541 is an equidigital number, since it uses as much as digits as its factorization.

22501541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81510.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 22501541 is about 4743.5789231339. The cubic root of 22501541 is about 282.3172535684.

The spelling of 22501541 in words is "twenty-two million, five hundred one thousand, five hundred forty-one".