3561928391 has 4 divisors (see below), whose sum is σ = 4070775312. Its totient is φ = 3053081472.

The previous prime is 3561928369. The next prime is 3561928397. The reversal of 3561928391 is 1938291653.

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

It is not a de Polignac number, because 3561928391 - 2¹⁸ = 3561666247 is a prime.

It is a super-2 number, since 2×3561928391² = 25374667725223697762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3561928397) 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, 254423450 + ... + 254423463.

It is an arithmetic number, because the mean of its divisors is an integer number (1017693828).

Almost surely, 2^3561928391 is an apocalyptic number.

3561928391 is a deficient number, since it is larger than the sum of its proper divisors (508846921).

3561928391 is an equidigital number, since it uses as much as digits as its factorization.

3561928391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508846920.

The product of its digits is 349920, while the sum is 47.

The square root of 3561928391 is about 59681.8933262007. The cubic root of 3561928391 is about 1527.1969969086.

The spelling of 3561928391 in words is "three billion, five hundred sixty-one million, nine hundred twenty-eight thousand, three hundred ninety-one".