7621997 has 2 divisors, whose sum is σ = 7621998. Its totient is φ = 7621996.

The previous prime is 7621981. The next prime is 7622053. The reversal of 7621997 is 7991267.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7123561 + 498436 = 2669^2 + 706^2 .

7621997 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 7621997 - 2⁴ = 7621981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7621927) 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, 3810998 + 3810999.

It is an arithmetic number, because the mean of its divisors is an integer number (3810999).

Almost surely, 2^7621997 is an apocalyptic number.

It is an amenable number.

7621997 is a deficient number, since it is larger than the sum of its proper divisors (1).

7621997 is an equidigital number, since it uses as much as digits as its factorization.

7621997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 41.

The square root of 7621997 is about 2760.7964430577. The cubic root of 7621997 is about 196.7990168529.

The spelling of 7621997 in words is "seven million, six hundred twenty-one thousand, nine hundred ninety-seven".