5721951649 has 4 divisors (see below), whose sum is σ = 5855020336. Its totient is φ = 5588882964.

The previous prime is 5721951637. The next prime is 5721951659. The reversal of 5721951649 is 9461591275.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5721951649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5721951659) 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, 66534279 + ... + 66534364.

It is an arithmetic number, because the mean of its divisors is an integer number (1463755084).

Almost surely, 2^5721951649 is an apocalyptic number.

It is an amenable number.

5721951649 is a deficient number, since it is larger than the sum of its proper divisors (133068687).

5721951649 is a wasteful number, since it uses less digits than its factorization.

5721951649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133068686.

The product of its digits is 680400, while the sum is 49.

The square root of 5721951649 is about 75643.5829994852. The cubic root of 5721951649 is about 1788.6061836689.

The spelling of 5721951649 in words is "five billion, seven hundred twenty-one million, nine hundred fifty-one thousand, six hundred forty-nine".