3947747317 has 2 divisors, whose sum is σ = 3947747318. Its totient is φ = 3947747316.

The previous prime is 3947747273. The next prime is 3947747341. The reversal of 3947747317 is 7137477493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3557645316 + 390102001 = 59646^2 + 19751^2 .

It is an emirp because it is prime and its reverse (7137477493) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3947747317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3947747357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1973873658 + 1973873659.

It is an arithmetic number, because the mean of its divisors is an integer number (1973873659).

Almost surely, 2^3947747317 is an apocalyptic number.

It is an amenable number.

3947747317 is a deficient number, since it is larger than the sum of its proper divisors (1).

3947747317 is an equidigital number, since it uses as much as digits as its factorization.

3947747317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3111696, while the sum is 52.

The square root of 3947747317 is about 62831.1015103189. The cubic root of 3947747317 is about 1580.4585696933.

The spelling of 3947747317 in words is "three billion, nine hundred forty-seven million, seven hundred forty-seven thousand, three hundred seventeen".