7865492381 has 2 divisors, whose sum is σ = 7865492382. Its totient is φ = 7865492380.

The previous prime is 7865492353. The next prime is 7865492389. The reversal of 7865492381 is 1832945687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7616925625 + 248566756 = 87275^2 + 15766^2 .

It is an emirp because it is prime and its reverse (1832945687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7865492381 - 2¹⁰ = 7865491357 is a prime.

It is a super-2 number, since 2×7865492381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7865492389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3932746190 + 3932746191.

It is an arithmetic number, because the mean of its divisors is an integer number (3932746191).

Almost surely, 2^7865492381 is an apocalyptic number.

It is an amenable number.

7865492381 is a deficient number, since it is larger than the sum of its proper divisors (1).

7865492381 is an equidigital number, since it uses as much as digits as its factorization.

7865492381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 53.

The square root of 7865492381 is about 88687.6112035948. The cubic root of 7865492381 is about 1988.7276178118.

The spelling of 7865492381 in words is "seven billion, eight hundred sixty-five million, four hundred ninety-two thousand, three hundred eighty-one".