22491851 has 4 divisors (see below), whose sum is σ = 22530000. Its totient is φ = 22453704.

The previous prime is 22491829. The next prime is 22491857. The reversal of 22491851 is 15819422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15819422 = 2 ⋅7909711.

It is a cyclic number.

It is not a de Polignac number, because 22491851 - 2⁶ = 22491787 is a prime.

It is a super-2 number, since 2×22491851² = 1011766722812402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22491857) 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, 18176 + ... + 19373.

It is an arithmetic number, because the mean of its divisors is an integer number (5632500).

Almost surely, 2^22491851 is an apocalyptic number.

22491851 is a deficient number, since it is larger than the sum of its proper divisors (38149).

22491851 is an equidigital number, since it uses as much as digits as its factorization.

22491851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38148.

The product of its digits is 5760, while the sum is 32.

The square root of 22491851 is about 4742.5574324409. The cubic root of 22491851 is about 282.2767223151.

The spelling of 22491851 in words is "twenty-two million, four hundred ninety-one thousand, eight hundred fifty-one".