81023077 has 2 divisors, whose sum is σ = 81023078. Its totient is φ = 81023076.

The previous prime is 81023053. The next prime is 81023083. The reversal of 81023077 is 77032018.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50893956 + 30129121 = 7134^2 + 5489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81023077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81023017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40511538 + 40511539.

It is an arithmetic number, because the mean of its divisors is an integer number (40511539).

Almost surely, 2^81023077 is an apocalyptic number.

It is an amenable number.

81023077 is a deficient number, since it is larger than the sum of its proper divisors (1).

81023077 is an equidigital number, since it uses as much as digits as its factorization.

81023077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 81023077 is about 9001.2819642538. The cubic root of 81023077 is about 432.7159570590.

The spelling of 81023077 in words is "eighty-one million, twenty-three thousand, seventy-seven".