6515347381 has 2 divisors, whose sum is σ = 6515347382. Its totient is φ = 6515347380.

The previous prime is 6515347373. The next prime is 6515347453. The reversal of 6515347381 is 1837435156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6468984900 + 46362481 = 80430^2 + 6809^2 .

It is a cyclic number.

It is not a de Polignac number, because 6515347381 - 2³ = 6515347373 is a prime.

It is a super-2 number, since 2×6515347381² = 84899502990207118322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6515347331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3257673690 + 3257673691.

It is an arithmetic number, because the mean of its divisors is an integer number (3257673691).

Almost surely, 2^6515347381 is an apocalyptic number.

It is an amenable number.

6515347381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6515347381 is an equidigital number, since it uses as much as digits as its factorization.

6515347381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 43.

The square root of 6515347381 is about 80717.7017821989. The cubic root of 6515347381 is about 1867.7232513458.

The spelling of 6515347381 in words is "six billion, five hundred fifteen million, three hundred forty-seven thousand, three hundred eighty-one".