81920053 has 2 divisors, whose sum is σ = 81920054. Its totient is φ = 81920052.

The previous prime is 81920023. The next prime is 81920063. The reversal of 81920053 is 35002918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79174404 + 2745649 = 8898^2 + 1657^2 .

It is a cyclic number.

It is not a de Polignac number, because 81920053 - 2⁵ = 81920021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81920023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40960026 + 40960027.

It is an arithmetic number, because the mean of its divisors is an integer number (40960027).

Almost surely, 2^81920053 is an apocalyptic number.

It is an amenable number.

81920053 is a deficient number, since it is larger than the sum of its proper divisors (1).

81920053 is an equidigital number, since it uses as much as digits as its factorization.

81920053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 81920053 is about 9050.9697270514. The cubic root of 81920053 is about 434.3069123167.

The spelling of 81920053 in words is "eighty-one million, nine hundred twenty thousand, fifty-three".