7814921 has 2 divisors, whose sum is σ = 7814922. Its totient is φ = 7814920.

The previous prime is 7814897. The next prime is 7814923. The reversal of 7814921 is 1294187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5290000 + 2524921 = 2300^2 + 1589^2 .

It is a cyclic number.

It is not a de Polignac number, because 7814921 - 2⁶ = 7814857 is a prime.

It is a super-2 number, since 2×7814921² = 122145980472482, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 7814923, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7814923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3907460 + 3907461.

It is an arithmetic number, because the mean of its divisors is an integer number (3907461).

Almost surely, 2^7814921 is an apocalyptic number.

It is an amenable number.

7814921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7814921 is an equidigital number, since it uses as much as digits as its factorization.

7814921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 32.

The square root of 7814921 is about 2795.5180199741. The cubic root of 7814921 is about 198.4456259016.

The spelling of 7814921 in words is "seven million, eight hundred fourteen thousand, nine hundred twenty-one".