7643621 has 2 divisors, whose sum is σ = 7643622. Its totient is φ = 7643620.

The previous prime is 7643609. The next prime is 7643633. The reversal of 7643621 is 1263467.

It is a balanced prime because it is at equal distance from previous prime (7643609) and next prime (7643633).

It can be written as a sum of positive squares in only one way, i.e., 7214596 + 429025 = 2686^2 + 655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7643621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7643021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3821810 + 3821811.

It is an arithmetic number, because the mean of its divisors is an integer number (3821811).

Almost surely, 2^7643621 is an apocalyptic number.

It is an amenable number.

7643621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7643621 is an equidigital number, since it uses as much as digits as its factorization.

7643621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 29.

The square root of 7643621 is about 2764.7099305352. The cubic root of 7643621 is about 196.9849507945.

The spelling of 7643621 in words is "seven million, six hundred forty-three thousand, six hundred twenty-one".