3524091721 has 6 divisors (see below), whose sum is σ = 3743585630. Its totient is φ = 3316791936.

The previous prime is 3524091713. The next prime is 3524091731. The reversal of 3524091721 is 1271904253.

It is a happy number.

3524091721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 2739475600 + 784616121 = 52340^2 + 28011^2 .

It is not a de Polignac number, because 3524091721 - 2³ = 3524091713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3524091731) 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, 6096756 + ... + 6097333.

Almost surely, 2^3524091721 is an apocalyptic number.

It is an amenable number.

3524091721 is a deficient number, since it is larger than the sum of its proper divisors (219493909).

3524091721 is a wasteful number, since it uses less digits than its factorization.

3524091721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12194123 (or 12194106 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 3524091721 is about 59364.0608533480. The cubic root of 3524091721 is about 1521.7701735094.

Adding to 3524091721 its reverse (1271904253), we get a palindrome (4795995974).

The spelling of 3524091721 in words is "three billion, five hundred twenty-four million, ninety-one thousand, seven hundred twenty-one".