81230269 has 2 divisors, whose sum is σ = 81230270. Its totient is φ = 81230268.

The previous prime is 81230221. The next prime is 81230287. The reversal of 81230269 is 96203218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56100100 + 25130169 = 7490^2 + 5013^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81230269 is a prime.

It is a super-2 number, since 2×81230269² = 13196713203624722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81230269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81230209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40615134 + 40615135.

It is an arithmetic number, because the mean of its divisors is an integer number (40615135).

Almost surely, 2^81230269 is an apocalyptic number.

It is an amenable number.

81230269 is a deficient number, since it is larger than the sum of its proper divisors (1).

81230269 is an equidigital number, since it uses as much as digits as its factorization.

81230269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 81230269 is about 9012.7836432481. The cubic root of 81230269 is about 433.0844898038.

The spelling of 81230269 in words is "eighty-one million, two hundred thirty thousand, two hundred sixty-nine".