29479859809 has 3 divisors (see below), whose sum is σ = 29480031507. Its totient is φ = 29479688112.

The previous prime is 29479859797. The next prime is 29479859813. The reversal of 29479859809 is 90895897492.

The square root of 29479859809 is 171697.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 4221750625 + 25258109184 = 64975^2 + 158928^2 .

It is not a de Polignac number, because 29479859809 - 2⁵ = 29479859777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29479859879) 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 2 ways as a sum of consecutive naturals, for example, 85849 + ... + 257545.

It is an arithmetic number, because the mean of its divisors is an integer number (9826677169).

Almost surely, 2^29479859809 is an apocalyptic number.

29479859809 is the 171697-th square number.

29479859809 is the 85849-th centered octagonal number.

It is an amenable number.

29479859809 is a deficient number, since it is larger than the sum of its proper divisors (171698).

29479859809 is an frugal number, since it uses more digits than its factorization.

29479859809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343394 (or 171697 counting only the distinct ones).

The product of its (nonzero) digits is 117573120, while the sum is 70.

The spelling of 29479859809 in words is "twenty-nine billion, four hundred seventy-nine million, eight hundred fifty-nine thousand, eight hundred nine".