7148821 has 2 divisors, whose sum is σ = 7148822. Its totient is φ = 7148820.

The previous prime is 7148809. The next prime is 7148839. The reversal of 7148821 is 1288417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3651921 + 3496900 = 1911^2 + 1870^2 .

It is a cyclic number.

It is not a de Polignac number, because 7148821 - 2¹⁹ = 6624533 is a prime.

It is a super-2 number, since 2×7148821² = 102211283380082, which contains 22 as substring.

It is equal to p₄₈₆₀₈₅ and since 7148821 and 486085 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7148521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3574410 + 3574411.

It is an arithmetic number, because the mean of its divisors is an integer number (3574411).

Almost surely, 2^7148821 is an apocalyptic number.

It is an amenable number.

7148821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7148821 is an equidigital number, since it uses as much as digits as its factorization.

7148821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 31.

The square root of 7148821 is about 2673.7279218350. The cubic root of 7148821 is about 192.6392628071.

The spelling of 7148821 in words is "seven million, one hundred forty-eight thousand, eight hundred twenty-one".