6749621 has 2 divisors, whose sum is σ = 6749622. Its totient is φ = 6749620.

The previous prime is 6749593. The next prime is 6749627. The reversal of 6749621 is 1269476.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4157521 + 2592100 = 2039^2 + 1610^2 .

It is a cyclic number.

It is not a de Polignac number, because 6749621 - 2²² = 2555317 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 (6749627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3374810 + 3374811.

It is an arithmetic number, because the mean of its divisors is an integer number (3374811).

Almost surely, 2^6749621 is an apocalyptic number.

It is an amenable number.

6749621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6749621 is an equidigital number, since it uses as much as digits as its factorization.

6749621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 6749621 is about 2598.0032717454. The cubic root of 6749621 is about 188.9846203063.

The spelling of 6749621 in words is "six million, seven hundred forty-nine thousand, six hundred twenty-one".