22251613 has 16 divisors (see below), whose sum is σ = 23794560. Its totient is φ = 20776000.

The previous prime is 22251611. The next prime is 22251631. The reversal of 22251613 is 31615222.

It is a cyclic number.

It is not a de Polignac number, because 22251613 - 2¹ = 22251611 is a prime.

It is a super-2 number, since 2×22251613² = 990268562203538, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22251611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207906 + ... + 208012.

It is an arithmetic number, because the mean of its divisors is an integer number (1487160).

Almost surely, 2^22251613 is an apocalyptic number.

It is an amenable number.

22251613 is a deficient number, since it is larger than the sum of its proper divisors (1542947).

22251613 is a wasteful number, since it uses less digits than its factorization.

22251613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308.

The product of its digits is 720, while the sum is 22.

The square root of 22251613 is about 4717.1615405877. The cubic root of 22251613 is about 281.2681128746.

Adding to 22251613 its reverse (31615222), we get a palindrome (53866835).

The spelling of 22251613 in words is "twenty-two million, two hundred fifty-one thousand, six hundred thirteen".