6401749 has 2 divisors, whose sum is σ = 6401750. Its totient is φ = 6401748.

The previous prime is 6401723. The next prime is 6401761. The reversal of 6401749 is 9471046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5846724 + 555025 = 2418^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 6401749 - 2⁷ = 6401621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6401749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6401719) 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, 3200874 + 3200875.

It is an arithmetic number, because the mean of its divisors is an integer number (3200875).

Almost surely, 2^6401749 is an apocalyptic number.

It is an amenable number.

6401749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401749 is an equidigital number, since it uses as much as digits as its factorization.

6401749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 6401749 is about 2530.1677809979. The cubic root of 6401749 is about 185.6804645934.

The spelling of 6401749 in words is "six million, four hundred one thousand, seven hundred forty-nine".