22161523 has 8 divisors (see below), whose sum is σ = 23816592. Its totient is φ = 20545536.

The previous prime is 22161509. The next prime is 22161527. The reversal of 22161523 is 32516122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22161523 - 2¹³ = 22153331 is a prime.

It is a super-2 number, since 2×22161523² = 982266203359058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22161494 and 22161503.

It is not an unprimeable number, because it can be changed into a prime (22161527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8590 + ... + 10867.

It is an arithmetic number, because the mean of its divisors is an integer number (2977074).

Almost surely, 2^22161523 is an apocalyptic number.

22161523 is a deficient number, since it is larger than the sum of its proper divisors (1655069).

22161523 is a wasteful number, since it uses less digits than its factorization.

22161523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19541.

The product of its digits is 720, while the sum is 22.

The square root of 22161523 is about 4707.6026807708. The cubic root of 22161523 is about 280.8880098136. Note that the first 3 decimals are identical.

Adding to 22161523 its reverse (32516122), we get a palindrome (54677645).

The spelling of 22161523 in words is "twenty-two million, one hundred sixty-one thousand, five hundred twenty-three".