5243981651 has 4 divisors (see below), whose sum is σ = 5245166904. Its totient is φ = 5242796400.

The previous prime is 5243981609. The next prime is 5243981657. The reversal of 5243981651 is 1561893425.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5243981651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5243981657) 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, 585965 + ... + 594846.

It is an arithmetic number, because the mean of its divisors is an integer number (1311291726).

Almost surely, 2^5243981651 is an apocalyptic number.

5243981651 is a deficient number, since it is larger than the sum of its proper divisors (1185253).

5243981651 is a wasteful number, since it uses less digits than its factorization.

5243981651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185252.

The product of its digits is 259200, while the sum is 44.

The square root of 5243981651 is about 72415.3412682699. The cubic root of 5243981651 is about 1737.3489433813.

The spelling of 5243981651 in words is "five billion, two hundred forty-three million, nine hundred eighty-one thousand, six hundred fifty-one".