22158001 has 8 divisors (see below), whose sum is σ = 23161320. Its totient is φ = 21170688.

The previous prime is 22157959. The next prime is 22158007. The reversal of 22158001 is 10085122.

It can be written as a sum of positive squares in 4 ways, for example, as 767376 + 21390625 = 876^2 + 4625^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22158001 - 2¹¹ = 22155953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22158001.

It is not an unprimeable number, because it can be changed into a prime (22158007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1126 + ... + 6751.

It is an arithmetic number, because the mean of its divisors is an integer number (2895165).

Almost surely, 2^22158001 is an apocalyptic number.

It is an amenable number.

22158001 is a deficient number, since it is larger than the sum of its proper divisors (1003319).

22158001 is an equidigital number, since it uses as much as digits as its factorization.

22158001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8003.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 22158001 is about 4707.2285901579. The cubic root of 22158001 is about 280.8731290676.

It can be divided in two parts, 2 and 2158001, that added together give a triangular number (2158003 = T₂₀₇₇).

The spelling of 22158001 in words is "twenty-two million, one hundred fifty-eight thousand, one".