3506356521 has 12 divisors (see below), whose sum is σ = 5080922548. Its totient is φ = 2330100864.

The previous prime is 3506356499. The next prime is 3506356523. The reversal of 3506356521 is 1256536053.

3506356521 is a `hidden beast` number, since 35 + 0 + 63 + 565 + 2 + 1 = 666.

3506356521 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 2 ways, for example, as 1062042921 + 2444313600 = 32589^2 + 49440^2 .

It is not a de Polignac number, because 3506356521 - 2²² = 3502162217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3506356523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 619540 + ... + 625173.

Almost surely, 2^3506356521 is an apocalyptic number.

It is an amenable number.

3506356521 is a deficient number, since it is larger than the sum of its proper divisors (1574566027).

3506356521 is a wasteful number, since it uses less digits than its factorization.

3506356521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245032 (or 1245029 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The square root of 3506356521 is about 59214.4958688327. The cubic root of 3506356521 is about 1519.2130796596.

The spelling of 3506356521 in words is "three billion, five hundred six million, three hundred fifty-six thousand, five hundred twenty-one".