4290521 has 4 divisors (see below), whose sum is σ = 4438500. Its totient is φ = 4142544.

The previous prime is 4290499. The next prime is 4290529. The reversal of 4290521 is 1250924.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3312400 + 978121 = 1820^2 + 989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4290521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4290529) 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 in 3 ways as a sum of consecutive naturals, for example, 73946 + ... + 74003.

It is an arithmetic number, because the mean of its divisors is an integer number (1109625).

Almost surely, 2^4290521 is an apocalyptic number.

It is an amenable number.

4290521 is a deficient number, since it is larger than the sum of its proper divisors (147979).

4290521 is a wasteful number, since it uses less digits than its factorization.

4290521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147978.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 4290521 is about 2071.3572844876. The cubic root of 4290521 is about 162.4937559731.

It can be divided in two parts, 4 and 290521, that multiplied together give a square (1162084 = 1078²).

The spelling of 4290521 in words is "four million, two hundred ninety thousand, five hundred twenty-one".