5211647905 has 4 divisors (see below), whose sum is σ = 6253977492. Its totient is φ = 4169318320.

The previous prime is 5211647899. The next prime is 5211647927. The reversal of 5211647905 is 5097461125.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2002652001 + 3208995904 = 44751^2 + 56648^2 .

It is a de Polignac number, because none of the positive numbers 2^k-5211647905 is a prime.

It is a super-2 number, since 2×5211647905² = 54322547771381778050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521164786 + ... + 521164795.

It is an arithmetic number, because the mean of its divisors is an integer number (1563494373).

Almost surely, 2^5211647905 is an apocalyptic number.

It is an amenable number.

5211647905 is a deficient number, since it is larger than the sum of its proper divisors (1042329587).

5211647905 is a wasteful number, since it uses less digits than its factorization.

5211647905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042329586.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 5211647905 is about 72191.7440224296. The cubic root of 5211647905 is about 1733.7708192022.

The spelling of 5211647905 in words is "five billion, two hundred eleven million, six hundred forty-seven thousand, nine hundred five".