80739521 has 2 divisors, whose sum is σ = 80739522. Its totient is φ = 80739520.

The previous prime is 80739481. The next prime is 80739523. The reversal of 80739521 is 12593708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66601921 + 14137600 = 8161^2 + 3760^2 .

It is a cyclic number.

It is not a de Polignac number, because 80739521 - 2⁶ = 80739457 is a prime.

Together with 80739523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80739523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40369760 + 40369761.

It is an arithmetic number, because the mean of its divisors is an integer number (40369761).

Almost surely, 2^80739521 is an apocalyptic number.

It is an amenable number.

80739521 is a deficient number, since it is larger than the sum of its proper divisors (1).

80739521 is an equidigital number, since it uses as much as digits as its factorization.

80739521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 80739521 is about 8985.5172917312. The cubic root of 80739521 is about 432.2105758516.

The spelling of 80739521 in words is "eighty million, seven hundred thirty-nine thousand, five hundred twenty-one".