22131555 has 16 divisors (see below), whose sum is σ = 35554464. Its totient is φ = 11755520.

The previous prime is 22131547. The next prime is 22131563. The reversal of 22131555 is 55513122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22131547) and next prime (22131563).

It is not a de Polignac number, because 22131555 - 2³ = 22131547 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 985 + ... + 6725.

It is an arithmetic number, because the mean of its divisors is an integer number (2222154).

Almost surely, 2^22131555 is an apocalyptic number.

22131555 is a deficient number, since it is larger than the sum of its proper divisors (13422909).

22131555 is a wasteful number, since it uses less digits than its factorization.

22131555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6006.

The product of its digits is 1500, while the sum is 24.

The square root of 22131555 is about 4704.4186675933. The cubic root of 22131555 is about 280.7613420901.

Adding to 22131555 its reverse (55513122), we get a palindrome (77644677).

The spelling of 22131555 in words is "twenty-two million, one hundred thirty-one thousand, five hundred fifty-five".