6987490621 has 2 divisors, whose sum is σ = 6987490622. Its totient is φ = 6987490620.

The previous prime is 6987490591. The next prime is 6987490633. The reversal of 6987490621 is 1260947896.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6960564900 + 26925721 = 83430^2 + 5189^2 .

It is a cyclic number.

It is not a de Polignac number, because 6987490621 - 2⁷ = 6987490493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6987490651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3493745310 + 3493745311.

It is an arithmetic number, because the mean of its divisors is an integer number (3493745311).

Almost surely, 2^6987490621 is an apocalyptic number.

It is an amenable number.

6987490621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6987490621 is an equidigital number, since it uses as much as digits as its factorization.

6987490621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 6987490621 is about 83591.2113861260. The cubic root of 6987490621 is about 1911.7909994476.

The spelling of 6987490621 in words is "six billion, nine hundred eighty-seven million, four hundred ninety thousand, six hundred twenty-one".