3561863691 has 16 divisors (see below), whose sum is σ = 4777943040. Its totient is φ = 2360201280.

The previous prime is 3561863687. The next prime is 3561863693. The reversal of 3561863691 is 1963681653.

3561863691 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3561863691 - 2² = 3561863687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3561863691.

It is not an unprimeable number, because it can be changed into a prime (3561863693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1140430 + ... + 1143548.

It is an arithmetic number, because the mean of its divisors is an integer number (298621440).

Almost surely, 2^3561863691 is an apocalyptic number.

3561863691 is a deficient number, since it is larger than the sum of its proper divisors (1216079349).

3561863691 is a wasteful number, since it uses less digits than its factorization.

3561863691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5306.

The product of its digits is 699840, while the sum is 48.

The square root of 3561863691 is about 59681.3512832945. The cubic root of 3561863691 is about 1527.1877500220.

The spelling of 3561863691 in words is "three billion, five hundred sixty-one million, eight hundred sixty-three thousand, six hundred ninety-one".