521441749 has 2 divisors, whose sum is σ = 521441750. Its totient is φ = 521441748.

The previous prime is 521441747. The next prime is 521441801. The reversal of 521441749 is 947144125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 513702225 + 7739524 = 22665^2 + 2782^2 .

It is a cyclic number.

It is not a de Polignac number, because 521441749 - 2¹ = 521441747 is a prime.

Together with 521441747, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521441743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260720874 + 260720875.

It is an arithmetic number, because the mean of its divisors is an integer number (260720875).

Almost surely, 2^521441749 is an apocalyptic number.

It is an amenable number.

521441749 is a deficient number, since it is larger than the sum of its proper divisors (1).

521441749 is an equidigital number, since it uses as much as digits as its factorization.

521441749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 521441749 is about 22835.0990582480. The cubic root of 521441749 is about 804.8876553224.

It can be divided in two parts, 52144174 and 9, that multiplied together give a triangular number (469297566 = T₃₀₆₃₆).

The spelling of 521441749 in words is "five hundred twenty-one million, four hundred forty-one thousand, seven hundred forty-nine".