81480793 has 2 divisors, whose sum is σ = 81480794. Its totient is φ = 81480792.

The previous prime is 81480713. The next prime is 81480857. The reversal of 81480793 is 39708418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74442384 + 7038409 = 8628^2 + 2653^2 .

It is a cyclic number.

It is not a de Polignac number, because 81480793 - 2¹⁷ = 81349721 is a prime.

It is not a weakly prime, because it can be changed into another prime (81480703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40740396 + 40740397.

It is an arithmetic number, because the mean of its divisors is an integer number (40740397).

Almost surely, 2^81480793 is an apocalyptic number.

It is an amenable number.

81480793 is a deficient number, since it is larger than the sum of its proper divisors (1).

81480793 is an equidigital number, since it uses as much as digits as its factorization.

81480793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 81480793 is about 9026.6712026084. The cubic root of 81480793 is about 433.5292612352.

The spelling of 81480793 in words is "eighty-one million, four hundred eighty thousand, seven hundred ninety-three".