7826521 has 2 divisors, whose sum is σ = 7826522. Its totient is φ = 7826520.

The previous prime is 7826513. The next prime is 7826551. The reversal of 7826521 is 1256287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6702921 + 1123600 = 2589^2 + 1060^2 .

It is a cyclic number.

It is not a de Polignac number, because 7826521 - 2³ = 7826513 is a prime.

It is a super-2 number, since 2×7826521² = 122508861926882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7826551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3913260 + 3913261.

It is an arithmetic number, because the mean of its divisors is an integer number (3913261).

Almost surely, 2^7826521 is an apocalyptic number.

It is an amenable number.

7826521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7826521 is an equidigital number, since it uses as much as digits as its factorization.

7826521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 7826521 is about 2797.5920002745. The cubic root of 7826521 is about 198.5437642888.

The spelling of 7826521 in words is "seven million, eight hundred twenty-six thousand, five hundred twenty-one".