22815261 has 12 divisors (see below), whose sum is σ = 37663392. Its totient is φ = 13037256.

The previous prime is 22815259. The next prime is 22815263. The reversal of 22815261 is 16251822.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22815259) and next prime (22815263).

It is not a de Polignac number, because 22815261 - 2¹ = 22815259 is a prime.

It is a super-2 number, since 2×22815261² = 1041072268996242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22815263) 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 11 ways as a sum of consecutive naturals, for example, 181011 + ... + 181136.

It is an arithmetic number, because the mean of its divisors is an integer number (3138616).

Almost surely, 2^22815261 is an apocalyptic number.

22815261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22815261 is a deficient number, since it is larger than the sum of its proper divisors (14848131).

22815261 is a wasteful number, since it uses less digits than its factorization.

22815261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362160 (or 362157 counting only the distinct ones).

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

The square root of 22815261 is about 4776.5323195808. The cubic root of 22815261 is about 283.6232399063.

The spelling of 22815261 in words is "twenty-two million, eight hundred fifteen thousand, two hundred sixty-one".