23147581 has 2 divisors, whose sum is σ = 23147582. Its totient is φ = 23147580.

The previous prime is 23147563. The next prime is 23147587. The reversal of 23147581 is 18574132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16040025 + 7107556 = 4005^2 + 2666^2 .

It is a cyclic number.

It is not a de Polignac number, because 23147581 - 2¹¹ = 23145533 is a prime.

It is a super-2 number, since 2×23147581² = 1071621012303122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1456924 and since 23147581 and 1456924 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23147587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11573790 + 11573791.

It is an arithmetic number, because the mean of its divisors is an integer number (11573791).

Almost surely, 2^23147581 is an apocalyptic number.

It is an amenable number.

23147581 is a deficient number, since it is larger than the sum of its proper divisors (1).

23147581 is an equidigital number, since it uses as much as digits as its factorization.

23147581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 23147581 is about 4811.1933031214. The cubic root of 23147581 is about 284.9936635505.

The spelling of 23147581 in words is "twenty-three million, one hundred forty-seven thousand, five hundred eighty-one".