81084037 has 2 divisors, whose sum is σ = 81084038. Its totient is φ = 81084036.

The previous prime is 81083987. The next prime is 81084053. The reversal of 81084037 is 73048018.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71927361 + 9156676 = 8481^2 + 3026^2 .

It is a cyclic number.

It is not a de Polignac number, because 81084037 - 2¹⁹ = 80559749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81084097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40542018 + 40542019.

It is an arithmetic number, because the mean of its divisors is an integer number (40542019).

Almost surely, 2^81084037 is an apocalyptic number.

It is an amenable number.

81084037 is a deficient number, since it is larger than the sum of its proper divisors (1).

81084037 is an equidigital number, since it uses as much as digits as its factorization.

81084037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 81084037 is about 9004.6675119074. The cubic root of 81084037 is about 432.8244518771.

The spelling of 81084037 in words is "eighty-one million, eighty-four thousand, thirty-seven".