5561947919 has 32 divisors (see below), whose sum is σ = 6798504960. Its totient is φ = 4484505600.

The previous prime is 5561947907. The next prime is 5561947921. The reversal of 5561947919 is 9197491655.

It is a cyclic number.

It is not a de Polignac number, because 5561947919 - 2⁸ = 5561947663 is a prime.

It is a super-2 number, since 2×5561947919² = 61870529307336861122, 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 (5561947999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 681674 + ... + 689784.

It is an arithmetic number, because the mean of its divisors is an integer number (212453280).

Almost surely, 2^5561947919 is an apocalyptic number.

5561947919 is a deficient number, since it is larger than the sum of its proper divisors (1236557041).

5561947919 is a wasteful number, since it uses less digits than its factorization.

5561947919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8351.

The product of its digits is 3061800, while the sum is 56.

The square root of 5561947919 is about 74578.4681996084. The cubic root of 5561947919 is about 1771.7766449138.

The spelling of 5561947919 in words is "five billion, five hundred sixty-one million, nine hundred forty-seven thousand, nine hundred nineteen".