80515517 has 2 divisors, whose sum is σ = 80515518. Its totient is φ = 80515516.

The previous prime is 80515511. The next prime is 80515531. The reversal of 80515517 is 71551508.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61058596 + 19456921 = 7814^2 + 4411^2 .

It is a cyclic number.

It is not a de Polignac number, because 80515517 - 2⁸ = 80515261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80515511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40257758 + 40257759.

It is an arithmetic number, because the mean of its divisors is an integer number (40257759).

Almost surely, 2^80515517 is an apocalyptic number.

It is an amenable number.

80515517 is a deficient number, since it is larger than the sum of its proper divisors (1).

80515517 is an equidigital number, since it uses as much as digits as its factorization.

80515517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 32.

The square root of 80515517 is about 8973.0439093989. The cubic root of 80515517 is about 431.8104968020.

The spelling of 80515517 in words is "eighty million, five hundred fifteen thousand, five hundred seventeen".