22251001 has 4 divisors (see below), whose sum is σ = 22266532. Its totient is φ = 22235472.

The previous prime is 22250999. The next prime is 22251013. The reversal of 22251001 is 10015222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15594601 + 6656400 = 3949^2 + 2580^2 .

It is a cyclic number.

It is not a de Polignac number, because 22251001 - 2¹ = 22250999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22251041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5370 + ... + 8563.

It is an arithmetic number, because the mean of its divisors is an integer number (5566633).

Almost surely, 2^22251001 is an apocalyptic number.

It is an amenable number.

22251001 is a deficient number, since it is larger than the sum of its proper divisors (15531).

22251001 is a wasteful number, since it uses less digits than its factorization.

22251001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15530.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 22251001 is about 4717.0966706227. The cubic root of 22251001 is about 281.2655342202.

Adding to 22251001 its reverse (10015222), we get a palindrome (32266223).

The spelling of 22251001 in words is "twenty-two million, two hundred fifty-one thousand, one".