81150737 has 2 divisors, whose sum is σ = 81150738. Its totient is φ = 81150736.

The previous prime is 81150721. The next prime is 81150749. The reversal of 81150737 is 73705118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68823616 + 12327121 = 8296^2 + 3511^2 .

It is a cyclic number.

It is not a de Polignac number, because 81150737 - 2⁴ = 81150721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81150337) 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, 40575368 + 40575369.

It is an arithmetic number, because the mean of its divisors is an integer number (40575369).

Almost surely, 2^81150737 is an apocalyptic number.

It is an amenable number.

81150737 is a deficient number, since it is larger than the sum of its proper divisors (1).

81150737 is an equidigital number, since it uses as much as digits as its factorization.

81150737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 81150737 is about 9008.3703853694. The cubic root of 81150737 is about 432.9431002967.

The spelling of 81150737 in words is "eighty-one million, one hundred fifty thousand, seven hundred thirty-seven".