7761421 has 2 divisors, whose sum is σ = 7761422. Its totient is φ = 7761420.

The previous prime is 7761409. The next prime is 7761427. The reversal of 7761421 is 1241677.

7761421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7590025 + 171396 = 2755^2 + 414^2 .

It is an emirp because it is prime and its reverse (1241677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7761421 - 2⁵ = 7761389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7761421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7761427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3880710 + 3880711.

It is an arithmetic number, because the mean of its divisors is an integer number (3880711).

Almost surely, 2^7761421 is an apocalyptic number.

It is an amenable number.

7761421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7761421 is an equidigital number, since it uses as much as digits as its factorization.

7761421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 28.

The square root of 7761421 is about 2785.9326983974. The cubic root of 7761421 is about 197.9917436955.

It can be divided in two parts, 776 and 1421, that added together give a cube (2197 = 13³).

The spelling of 7761421 in words is "seven million, seven hundred sixty-one thousand, four hundred twenty-one".