29719011981 has 8 divisors (see below), whose sum is σ = 40216772704. Its totient is φ = 19516962960.

The previous prime is 29719011947. The next prime is 29719011983. The reversal of 29719011981 is 18911091792.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 29719011981 - 2⁷ = 29719011853 is a prime.

It is a super-2 number, since 2×29719011981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 29719011981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29719011983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73927690 + ... + 73928091.

It is an arithmetic number, because the mean of its divisors is an integer number (5027096588).

Almost surely, 2^29719011981 is an apocalyptic number.

It is an amenable number.

29719011981 is a deficient number, since it is larger than the sum of its proper divisors (10497760723).

29719011981 is a wasteful number, since it uses less digits than its factorization.

29719011981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147855851.

The product of its (nonzero) digits is 81648, while the sum is 48.

The spelling of 29719011981 in words is "twenty-nine billion, seven hundred nineteen million, eleven thousand, nine hundred eighty-one".