81928037 has 2 divisors, whose sum is σ = 81928038. Its totient is φ = 81928036.

The previous prime is 81927991. The next prime is 81928039. The reversal of 81928037 is 73082918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81739681 + 188356 = 9041^2 + 434^2 .

It is a cyclic number.

It is not a de Polignac number, because 81928037 - 2²⁶ = 14819173 is a prime.

Together with 81928039, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81928039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40964018 + 40964019.

It is an arithmetic number, because the mean of its divisors is an integer number (40964019).

Almost surely, 2^81928037 is an apocalyptic number.

It is an amenable number.

81928037 is a deficient number, since it is larger than the sum of its proper divisors (1).

81928037 is an equidigital number, since it uses as much as digits as its factorization.

81928037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 81928037 is about 9051.4107740175. The cubic root of 81928037 is about 434.3210211689.

The spelling of 81928037 in words is "eighty-one million, nine hundred twenty-eight thousand, thirty-seven".