81233057 has 2 divisors, whose sum is σ = 81233058. Its totient is φ = 81233056.

The previous prime is 81233041. The next prime is 81233069. The reversal of 81233057 is 75033218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61528336 + 19704721 = 7844^2 + 4439^2 .

It is a cyclic number.

It is not a de Polignac number, because 81233057 - 2⁴ = 81233041 is a prime.

It is not a weakly prime, because it can be changed into another prime (81233357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40616528 + 40616529.

It is an arithmetic number, because the mean of its divisors is an integer number (40616529).

Almost surely, 2^81233057 is an apocalyptic number.

It is an amenable number.

81233057 is a deficient number, since it is larger than the sum of its proper divisors (1).

81233057 is an equidigital number, since it uses as much as digits as its factorization.

81233057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 81233057 is about 9012.9383111170. The cubic root of 81233057 is about 433.0894445485.

The spelling of 81233057 in words is "eighty-one million, two hundred thirty-three thousand, fifty-seven".