6521254997 has 2 divisors, whose sum is σ = 6521254998. Its totient is φ = 6521254996.

The previous prime is 6521254979. The next prime is 6521255009. The reversal of 6521254997 is 7994521256.

Together with previous prime (6521254979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6401440081 + 119814916 = 80009^2 + 10946^2 .

It is a cyclic number.

It is not a de Polignac number, because 6521254997 - 2⁶ = 6521254933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6521254697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3260627498 + 3260627499.

It is an arithmetic number, because the mean of its divisors is an integer number (3260627499).

Almost surely, 2^6521254997 is an apocalyptic number.

It is an amenable number.

6521254997 is a deficient number, since it is larger than the sum of its proper divisors (1).

6521254997 is an equidigital number, since it uses as much as digits as its factorization.

6521254997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 50.

The square root of 6521254997 is about 80754.2877932807. The cubic root of 6521254997 is about 1868.2875834237.

The spelling of 6521254997 in words is "six billion, five hundred twenty-one million, two hundred fifty-four thousand, nine hundred ninety-seven".