22001551 has 24 divisors (see below), whose sum is σ = 26544672. Its totient is φ = 18110400.

The previous prime is 22001533. The next prime is 22001597. The reversal of 22001551 is 15510022.

It is not a de Polignac number, because 22001551 - 2¹⁵ = 21968783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111585 + ... + 111781.

It is an arithmetic number, because the mean of its divisors is an integer number (1106028).

Almost surely, 2^22001551 is an apocalyptic number.

22001551 is a deficient number, since it is larger than the sum of its proper divisors (4543121).

22001551 is a wasteful number, since it uses less digits than its factorization.

22001551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 22001551 is about 4690.5810940650. The cubic root of 22001551 is about 280.2105177032.

Adding to 22001551 its reverse (15510022), we get a palindrome (37511573).

The spelling of 22001551 in words is "twenty-two million, one thousand, five hundred fifty-one".