22161913 has 6 divisors (see below), whose sum is σ = 22439114. Its totient is φ = 21888096.

The previous prime is 22161911. The next prime is 22161917. The reversal of 22161913 is 31916122.

It can be written as a sum of positive squares in only one way, i.e., 21603904 + 558009 = 4648^2 + 747^2 .

It is not a de Polignac number, because 22161913 - 2¹ = 22161911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22161911) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 5281 + ... + 8497.

Almost surely, 2^22161913 is an apocalyptic number.

It is an amenable number.

22161913 is a deficient number, since it is larger than the sum of its proper divisors (277201).

22161913 is an frugal number, since it uses more digits than its factorization.

22161913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3383 (or 3300 counting only the distinct ones).

The product of its digits is 648, while the sum is 25.

The square root of 22161913 is about 4707.6441029458. The cubic root of 22161913 is about 280.8896574994.

The spelling of 22161913 in words is "twenty-two million, one hundred sixty-one thousand, nine hundred thirteen".