6521740631 has 4 divisors (see below), whose sum is σ = 7453417872. Its totient is φ = 5590063392.

The previous prime is 6521740627. The next prime is 6521740637. The reversal of 6521740631 is 1360471256.

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 6521740631 - 2² = 6521740627 is a prime.

It is a super-2 number, since 2×6521740631² = 85066201716072556322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6521740591 and 6521740600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521740637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465838610 + ... + 465838623.

It is an arithmetic number, because the mean of its divisors is an integer number (1863354468).

Almost surely, 2^6521740631 is an apocalyptic number.

6521740631 is a deficient number, since it is larger than the sum of its proper divisors (931677241).

6521740631 is an equidigital number, since it uses as much as digits as its factorization.

6521740631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931677240.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 6521740631 is about 80757.2945993116. The cubic root of 6521740631 is about 1868.3339590294. Note that the first 3 decimals are identical.

The spelling of 6521740631 in words is "six billion, five hundred twenty-one million, seven hundred forty thousand, six hundred thirty-one".