22261581 has 16 divisors (see below), whose sum is σ = 33073920. Its totient is φ = 14798880.

The previous prime is 22261579. The next prime is 22261637. The reversal of 22261581 is 18516222.

It is a happy number.

22261581 is a `hidden beast` number, since 2 + 22 + 61 + 581 = 666.

It is not a de Polignac number, because 22261581 - 2¹ = 22261579 is a prime.

It is a super-2 number, since 2×22261581² = 991155977239122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22261571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10681 + ... + 12593.

It is an arithmetic number, because the mean of its divisors is an integer number (2067120).

Almost surely, 2^22261581 is an apocalyptic number.

It is an amenable number.

22261581 is a deficient number, since it is larger than the sum of its proper divisors (10812339).

22261581 is a wasteful number, since it uses less digits than its factorization.

22261581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2353 (or 2347 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 22261581 is about 4718.2179898771. The cubic root of 22261581 is about 281.3101062648.

The spelling of 22261581 in words is "twenty-two million, two hundred sixty-one thousand, five hundred eighty-one".