81230957 has 2 divisors, whose sum is σ = 81230958. Its totient is φ = 81230956.

The previous prime is 81230921. The next prime is 81230959. The reversal of 81230957 is 75903218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79459396 + 1771561 = 8914^2 + 1331^2 .

It is a cyclic number.

It is not a de Polignac number, because 81230957 - 2⁶ = 81230893 is a prime.

Together with 81230959, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81230959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40615478 + 40615479.

It is an arithmetic number, because the mean of its divisors is an integer number (40615479).

Almost surely, 2^81230957 is an apocalyptic number.

It is an amenable number.

81230957 is a deficient number, since it is larger than the sum of its proper divisors (1).

81230957 is an equidigital number, since it uses as much as digits as its factorization.

81230957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 81230957 is about 9012.8218111755. The cubic root of 81230957 is about 433.0857125060.

The spelling of 81230957 in words is "eighty-one million, two hundred thirty thousand, nine hundred fifty-seven".