7861542313 has 2 divisors, whose sum is σ = 7861542314. Its totient is φ = 7861542312.

The previous prime is 7861542287. The next prime is 7861542341. The reversal of 7861542313 is 3132451687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6638501529 + 1223040784 = 81477^2 + 34972^2 .

It is a cyclic number.

It is not a de Polignac number, because 7861542313 - 2⁹ = 7861541801 is a prime.

It is not a weakly prime, because it can be changed into another prime (7861542613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3930771156 + 3930771157.

It is an arithmetic number, because the mean of its divisors is an integer number (3930771157).

Almost surely, 2^7861542313 is an apocalyptic number.

It is an amenable number.

7861542313 is a deficient number, since it is larger than the sum of its proper divisors (1).

7861542313 is an equidigital number, since it uses as much as digits as its factorization.

7861542313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 7861542313 is about 88665.3388478271. The cubic root of 7861542313 is about 1988.3946475689.

The spelling of 7861542313 in words is "seven billion, eight hundred sixty-one million, five hundred forty-two thousand, three hundred thirteen".