81246037 has 2 divisors, whose sum is σ = 81246038. Its totient is φ = 81246036.

The previous prime is 81246031. The next prime is 81246041. The reversal of 81246037 is 73064218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78393316 + 2852721 = 8854^2 + 1689^2 .

It is a cyclic number.

It is not a de Polignac number, because 81246037 - 2³ = 81246029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81246031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40623018 + 40623019.

It is an arithmetic number, because the mean of its divisors is an integer number (40623019).

Almost surely, 2^81246037 is an apocalyptic number.

It is an amenable number.

81246037 is a deficient number, since it is larger than the sum of its proper divisors (1).

81246037 is an equidigital number, since it uses as much as digits as its factorization.

81246037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 81246037 is about 9013.6583582916. The cubic root of 81246037 is about 433.1125106984.

It can be divided in two parts, 8124 and 6037, that added together give a square (14161 = 119²).

The spelling of 81246037 in words is "eighty-one million, two hundred forty-six thousand, thirty-seven".