1671712517 has 2 divisors, whose sum is σ = 1671712518. Its totient is φ = 1671712516.

The previous prime is 1671712513. The next prime is 1671712547. The reversal of 1671712517 is 7152171761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1517803681 + 153908836 = 38959^2 + 12406^2 .

It is a cyclic number.

It is not a de Polignac number, because 1671712517 - 2² = 1671712513 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1671712513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835856258 + 835856259.

It is an arithmetic number, because the mean of its divisors is an integer number (835856259).

Almost surely, 2^1671712517 is an apocalyptic number.

It is an amenable number.

1671712517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671712517 is an equidigital number, since it uses as much as digits as its factorization.

1671712517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20580, while the sum is 38.

The square root of 1671712517 is about 40886.5811361136. The cubic root of 1671712517 is about 1186.8263994658.

The spelling of 1671712517 in words is "one billion, six hundred seventy-one million, seven hundred twelve thousand, five hundred seventeen".