22091501 has 2 divisors, whose sum is σ = 22091502. Its totient is φ = 22091500.

The previous prime is 22091473. The next prime is 22091507. The reversal of 22091501 is 10519022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19811401 + 2280100 = 4451^2 + 1510^2 .

It is a cyclic number.

It is not a de Polignac number, because 22091501 - 2¹⁴ = 22075117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22091507) 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 as a sum of consecutive naturals, namely, 11045750 + 11045751.

It is an arithmetic number, because the mean of its divisors is an integer number (11045751).

Almost surely, 2^22091501 is an apocalyptic number.

It is an amenable number.

22091501 is a deficient number, since it is larger than the sum of its proper divisors (1).

22091501 is an equidigital number, since it uses as much as digits as its factorization.

22091501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 22091501 is about 4700.1596781386. The cubic root of 22091501 is about 280.5918645307.

The spelling of 22091501 in words is "twenty-two million, ninety-one thousand, five hundred one".