521214749 has 16 divisors (see below), whose sum is σ = 588349440. Its totient is φ = 457446000.

The previous prime is 521214697. The next prime is 521214779. The reversal of 521214749 is 947412125.

It is not a de Polignac number, because 521214749 - 2⁸ = 521214493 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521214779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161744 + ... + 164934.

It is an arithmetic number, because the mean of its divisors is an integer number (36771840).

Almost surely, 2^521214749 is an apocalyptic number.

It is an amenable number.

521214749 is a deficient number, since it is larger than the sum of its proper divisors (67134691).

521214749 is a wasteful number, since it uses less digits than its factorization.

With its successor (521214750) it forms an eRAP, since the sums of their prime factors are consecutive (3712 and 3713).

521214749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3712.

The product of its digits is 20160, while the sum is 35.

The square root of 521214749 is about 22830.1280986332. The cubic root of 521214749 is about 804.7708407293.

The spelling of 521214749 in words is "five hundred twenty-one million, two hundred fourteen thousand, seven hundred forty-nine".