3520903681 has 4 divisors (see below), whose sum is σ = 3530497792. Its totient is φ = 3511309572.

The previous prime is 3520903663. The next prime is 3520903723. The reversal of 3520903681 is 1863090253.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3520903681 - 2¹³ = 3520895489 is a prime.

It is a super-2 number, since 2×3520903681² = 24793525461758699522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3520903681.

It is not an unprimeable number, because it can be changed into a prime (3520903651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4796505 + ... + 4797238.

It is an arithmetic number, because the mean of its divisors is an integer number (882624448).

Almost surely, 2^3520903681 is an apocalyptic number.

It is an amenable number.

3520903681 is a deficient number, since it is larger than the sum of its proper divisors (9594111).

3520903681 is an equidigital number, since it uses as much as digits as its factorization.

3520903681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9594110.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 3520903681 is about 59337.2031781074. The cubic root of 3520903681 is about 1521.3111495254.

The spelling of 3520903681 in words is "three billion, five hundred twenty million, nine hundred three thousand, six hundred eighty-one".