3971267513 has 2 divisors, whose sum is σ = 3971267514. Its totient is φ = 3971267512.

The previous prime is 3971267449. The next prime is 3971267527. The reversal of 3971267513 is 3157621793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3690805504 + 280462009 = 60752^2 + 16747^2 .

It is an emirp because it is prime and its reverse (3157621793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3971267513 - 2⁶ = 3971267449 is a prime.

It is a plaindrome in base 9.

It is not a weakly prime, because it can be changed into another prime (3971267543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1985633756 + 1985633757.

It is an arithmetic number, because the mean of its divisors is an integer number (1985633757).

Almost surely, 2^3971267513 is an apocalyptic number.

It is an amenable number.

3971267513 is a deficient number, since it is larger than the sum of its proper divisors (1).

3971267513 is an equidigital number, since it uses as much as digits as its factorization.

3971267513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238140, while the sum is 44.

The square root of 3971267513 is about 63017.9935653302. The cubic root of 3971267513 is about 1583.5910831899.

The spelling of 3971267513 in words is "three billion, nine hundred seventy-one million, two hundred sixty-seven thousand, five hundred thirteen".