81003697 has 2 divisors, whose sum is σ = 81003698. Its totient is φ = 81003696.

The previous prime is 81003667. The next prime is 81003721. The reversal of 81003697 is 79630018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74028816 + 6974881 = 8604^2 + 2641^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81003697 is a prime.

It is not a weakly prime, because it can be changed into another prime (81003667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40501848 + 40501849.

It is an arithmetic number, because the mean of its divisors is an integer number (40501849).

Almost surely, 2^81003697 is an apocalyptic number.

It is an amenable number.

81003697 is a deficient number, since it is larger than the sum of its proper divisors (1).

81003697 is an equidigital number, since it uses as much as digits as its factorization.

81003697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 81003697 is about 9000.2053865454. The cubic root of 81003697 is about 432.6814537040.

The spelling of 81003697 in words is "eighty-one million, three thousand, six hundred ninety-seven".