5651939971 has 4 divisors (see below), whose sum is σ = 5736297352. Its totient is φ = 5567582592.

The previous prime is 5651939947. The next prime is 5651940001. The reversal of 5651939971 is 1799391565.

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

It is a cyclic number.

It is not a de Polignac number, because 5651939971 - 2²¹ = 5649842819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5651939911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42178590 + ... + 42178723.

It is an arithmetic number, because the mean of its divisors is an integer number (1434074338).

Almost surely, 2^5651939971 is an apocalyptic number.

5651939971 is a deficient number, since it is larger than the sum of its proper divisors (84357381).

5651939971 is an equidigital number, since it uses as much as digits as its factorization.

5651939971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84357380.

The product of its digits is 2296350, while the sum is 55.

The square root of 5651939971 is about 75179.3852794767. The cubic root of 5651939971 is about 1781.2813198868.

The spelling of 5651939971 in words is "five billion, six hundred fifty-one million, nine hundred thirty-nine thousand, nine hundred seventy-one".