6425521 has 2 divisors, whose sum is σ = 6425522. Its totient is φ = 6425520.

The previous prime is 6425509. The next prime is 6425527. The reversal of 6425521 is 1255246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6195121 + 230400 = 2489^2 + 480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6425521 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6425527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3212760 + 3212761.

It is an arithmetic number, because the mean of its divisors is an integer number (3212761).

Almost surely, 2^6425521 is an apocalyptic number.

It is an amenable number.

6425521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6425521 is an equidigital number, since it uses as much as digits as its factorization.

6425521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 25.

The square root of 6425521 is about 2534.8611401811. The cubic root of 6425521 is about 185.9100135111.

The spelling of 6425521 in words is "six million, four hundred twenty-five thousand, five hundred twenty-one".