22415261 has 4 divisors (see below), whose sum is σ = 24453024. Its totient is φ = 20377500.

The previous prime is 22415249. The next prime is 22415297. The reversal of 22415261 is 16251422.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-22415261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22415461) 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, 1018865 + ... + 1018886.

It is an arithmetic number, because the mean of its divisors is an integer number (6113256).

Almost surely, 2^22415261 is an apocalyptic number.

It is an amenable number.

22415261 is a deficient number, since it is larger than the sum of its proper divisors (2037763).

22415261 is a wasteful number, since it uses less digits than its factorization.

22415261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037762.

The product of its digits is 960, while the sum is 23.

The square root of 22415261 is about 4734.4757893562. The cubic root of 22415261 is about 281.9559519082.

Adding to 22415261 its reverse (16251422), we get a palindrome (38666683).

The spelling of 22415261 in words is "twenty-two million, four hundred fifteen thousand, two hundred sixty-one".