5721511394 has 8 divisors (see below), whose sum is σ = 8582855148. Its totient is φ = 2860559680.

The previous prime is 5721511339. The next prime is 5721511399. The reversal of 5721511394 is 4931151275.

It can be written as a sum of positive squares in 2 ways, for example, as 3826041025 + 1895470369 = 61855^2 + 43537^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (5721511399) 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, 58307 + ... + 121830.

Almost surely, 2^5721511394 is an apocalyptic number.

5721511394 is a deficient number, since it is larger than the sum of its proper divisors (2861343754).

5721511394 is a wasteful number, since it uses less digits than its factorization.

5721511394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196020.

The product of its digits is 37800, while the sum is 38.

The square root of 5721511394 is about 75640.6728817242. The cubic root of 5721511394 is about 1788.5603098680.

The spelling of 5721511394 in words is "five billion, seven hundred twenty-one million, five hundred eleven thousand, three hundred ninety-four".