81367037 has 2 divisors, whose sum is σ = 81367038. Its totient is φ = 81367036.

The previous prime is 81367021. The next prime is 81367043. The reversal of 81367037 is 73076318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77810041 + 3556996 = 8821^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 81367037 - 2⁴ = 81367021 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81366988 and 81367006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81367067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40683518 + 40683519.

It is an arithmetic number, because the mean of its divisors is an integer number (40683519).

Almost surely, 2^81367037 is an apocalyptic number.

It is an amenable number.

81367037 is a deficient number, since it is larger than the sum of its proper divisors (1).

81367037 is an equidigital number, since it uses as much as digits as its factorization.

81367037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 81367037 is about 9020.3678971536. The cubic root of 81367037 is about 433.3274160270.

The spelling of 81367037 in words is "eighty-one million, three hundred sixty-seven thousand, thirty-seven".