29121679549 has 4 divisors (see below), whose sum is σ = 29213546364. Its totient is φ = 29029812736.

The previous prime is 29121679519. The next prime is 29121679567. The reversal of 29121679549 is 94597612192.

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 1590573924 + 27531105625 = 39882^2 + 165925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29121679549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 29121679549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29121679519) 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, 45932932 + ... + 45933565.

It is an arithmetic number, because the mean of its divisors is an integer number (7303386591).

Almost surely, 2^29121679549 is an apocalyptic number.

It is an amenable number.

29121679549 is a deficient number, since it is larger than the sum of its proper divisors (91866815).

29121679549 is an equidigital number, since it uses as much as digits as its factorization.

29121679549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91866814.

The product of its digits is 2449440, while the sum is 55.

The spelling of 29121679549 in words is "twenty-nine billion, one hundred twenty-one million, six hundred seventy-nine thousand, five hundred forty-nine".