8213439569 has 4 divisors (see below), whose sum is σ = 8225024820. Its totient is φ = 8201854320.

The previous prime is 8213439557. The next prime is 8213439599. The reversal of 8213439569 is 9659343128.

It is a happy number.

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 4504020544 + 3709419025 = 67112^2 + 60905^2 .

It is a cyclic number.

It is not a de Polignac number, because 8213439569 - 2¹² = 8213435473 is a prime.

It is a super-2 number, since 2×8213439569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8213439599) 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, 5791562 + ... + 5792979.

It is an arithmetic number, because the mean of its divisors is an integer number (2056256205).

Almost surely, 2^8213439569 is an apocalyptic number.

It is an amenable number.

8213439569 is a deficient number, since it is larger than the sum of its proper divisors (11585251).

8213439569 is a wasteful number, since it uses less digits than its factorization.

8213439569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11585250.

The product of its digits is 1399680, while the sum is 50.

The square root of 8213439569 is about 90628.0286059451. The cubic root of 8213439569 is about 2017.6307523357.

The spelling of 8213439569 in words is "eight billion, two hundred thirteen million, four hundred thirty-nine thousand, five hundred sixty-nine".