22156001 has 4 divisors (see below), whose sum is σ = 25321152. Its totient is φ = 18990852.

The previous prime is 22155989. The next prime is 22156003. The reversal of 22156001 is 10065122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22156001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22156003) 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, 1582565 + ... + 1582578.

It is an arithmetic number, because the mean of its divisors is an integer number (6330288).

Almost surely, 2^22156001 is an apocalyptic number.

It is an amenable number.

22156001 is a deficient number, since it is larger than the sum of its proper divisors (3165151).

22156001 is an equidigital number, since it uses as much as digits as its factorization.

22156001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165150.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 22156001 is about 4707.0161461376. The cubic root of 22156001 is about 280.8646781976.

The spelling of 22156001 in words is "twenty-two million, one hundred fifty-six thousand, one".