6521257049 has 2 divisors, whose sum is σ = 6521257050. Its totient is φ = 6521257048.

The previous prime is 6521257027. The next prime is 6521257051. The reversal of 6521257049 is 9407521256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6297216025 + 224041024 = 79355^2 + 14968^2 .

It is a cyclic number.

It is not a de Polignac number, because 6521257049 - 2¹² = 6521252953 is a prime.

Together with 6521257051, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6521256997 and 6521257015.

It is not a weakly prime, because it can be changed into another prime (6521257549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3260628524 + 3260628525.

It is an arithmetic number, because the mean of its divisors is an integer number (3260628525).

Almost surely, 2^6521257049 is an apocalyptic number.

It is an amenable number.

6521257049 is a deficient number, since it is larger than the sum of its proper divisors (1).

6521257049 is an equidigital number, since it uses as much as digits as its factorization.

6521257049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 6521257049 is about 80754.3004984874. The cubic root of 6521257049 is about 1868.2877793842.

The spelling of 6521257049 in words is "six billion, five hundred twenty-one million, two hundred fifty-seven thousand, forty-nine".