29651806809 has 75 divisors (see below), whose sum is σ = 47654294303. Its totient is φ = 18374108688.

The previous prime is 29651806799. The next prime is 29651806817. The reversal of 29651806809 is 90860815692.

It is a happy number.

The square root of 29651806809 is 172197.

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

It can be written as a sum of positive squares in only one way, i.e., 21375902025 + 8275904784 = 146205^2 + 90972^2 .

It is not a de Polignac number, because 29651806809 - 2¹⁷ = 29651675737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29651806859) 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 74 ways as a sum of consecutive naturals, for example, 559468027 + ... + 559468079.

Almost surely, 2^29651806809 is an apocalyptic number.

29651806809 is the 172197-th square number.

29651806809 is the 86099-th centered octagonal number.

It is an amenable number.

29651806809 is a deficient number, since it is larger than the sum of its proper divisors (18002487494).

29651806809 is an frugal number, since it uses more digits than its factorization.

29651806809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 29651806809 in words is "twenty-nine billion, six hundred fifty-one million, eight hundred six thousand, eight hundred nine".