81022037 has 2 divisors, whose sum is σ = 81022038. Its totient is φ = 81022036.

The previous prime is 81022033. The next prime is 81022057. The reversal of 81022037 is 73022018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77281681 + 3740356 = 8791^2 + 1934^2 .

It is a cyclic number.

It is not a de Polignac number, because 81022037 - 2² = 81022033 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81022033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40511018 + 40511019.

It is an arithmetic number, because the mean of its divisors is an integer number (40511019).

Almost surely, 2^81022037 is an apocalyptic number.

It is an amenable number.

81022037 is a deficient number, since it is larger than the sum of its proper divisors (1).

81022037 is an equidigital number, since it uses as much as digits as its factorization.

81022037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 81022037 is about 9001.2241945193. The cubic root of 81022037 is about 432.7141056255.

The spelling of 81022037 in words is "eighty-one million, twenty-two thousand, thirty-seven".