8521749 has 6 divisors (see below), whose sum is σ = 12309206. Its totient is φ = 5681160.

The previous prime is 8521739. The next prime is 8521759. The reversal of 8521749 is 9471258.

8521749 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8521739) and next prime (8521759).

It can be written as a sum of positive squares in only one way, i.e., 7387524 + 1134225 = 2718^2 + 1065^2 .

It is not a de Polignac number, because 8521749 - 2⁹ = 8521237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8521739) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 473422 + ... + 473439.

Almost surely, 2^8521749 is an apocalyptic number.

It is an amenable number.

8521749 is a deficient number, since it is larger than the sum of its proper divisors (3787457).

8521749 is a wasteful number, since it uses less digits than its factorization.

8521749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946867 (or 946864 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 8521749 is about 2919.2034872547. The cubic root of 8521749 is about 204.2566694302.

It can be divided in two parts, 852 and 1749, that added together give a square (2601 = 51²).

The spelling of 8521749 in words is "eight million, five hundred twenty-one thousand, seven hundred forty-nine".