22081487 has 4 divisors (see below), whose sum is σ = 23380416. Its totient is φ = 20782560.

The previous prime is 22081481. The next prime is 22081561. The reversal of 22081487 is 78418022.

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

It is a cyclic number.

It is not a de Polignac number, because 22081487 - 2⁴ = 22081471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22081481) 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, 649439 + ... + 649472.

It is an arithmetic number, because the mean of its divisors is an integer number (5845104).

Almost surely, 2^22081487 is an apocalyptic number.

22081487 is a deficient number, since it is larger than the sum of its proper divisors (1298929).

22081487 is a wasteful number, since it uses less digits than its factorization.

22081487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298928.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 22081487 is about 4699.0942744320. The cubic root of 22081487 is about 280.5494610199.

The spelling of 22081487 in words is "twenty-two million, eighty-one thousand, four hundred eighty-seven".