23145281 has 2 divisors, whose sum is σ = 23145282. Its totient is φ = 23145280.

The previous prime is 23145271. The next prime is 23145293. The reversal of 23145281 is 18254132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21160000 + 1985281 = 4600^2 + 1409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23145281 is a prime.

It is a super-2 number, since 2×23145281² = 1071408065137922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23145281.

It is not a weakly prime, because it can be changed into another prime (23145271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11572640 + 11572641.

It is an arithmetic number, because the mean of its divisors is an integer number (11572641).

Almost surely, 2^23145281 is an apocalyptic number.

It is an amenable number.

23145281 is a deficient number, since it is larger than the sum of its proper divisors (1).

23145281 is an equidigital number, since it uses as much as digits as its factorization.

23145281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 26.

The square root of 23145281 is about 4810.9542712439. The cubic root of 23145281 is about 284.9842240165.

The spelling of 23145281 in words is "twenty-three million, one hundred forty-five thousand, two hundred eighty-one".