81037529 has 2 divisors, whose sum is σ = 81037530. Its totient is φ = 81037528.

The previous prime is 81037507. The next prime is 81037543. The reversal of 81037529 is 92573018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65983129 + 15054400 = 8123^2 + 3880^2 .

It is a cyclic number.

It is not a de Polignac number, because 81037529 - 2⁸ = 81037273 is a prime.

It is a super-2 number, since 2×81037529² = 13134162212851682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81033529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40518764 + 40518765.

It is an arithmetic number, because the mean of its divisors is an integer number (40518765).

Almost surely, 2^81037529 is an apocalyptic number.

It is an amenable number.

81037529 is a deficient number, since it is larger than the sum of its proper divisors (1).

81037529 is an equidigital number, since it uses as much as digits as its factorization.

81037529 is an evil number, because the sum of its binary digits is even.

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

The square root of 81037529 is about 9002.0847030007. The cubic root of 81037529 is about 432.7416832243.

The spelling of 81037529 in words is "eighty-one million, thirty-seven thousand, five hundred twenty-nine".