29257693991 has 4 divisors (see below), whose sum is σ = 30978734832. Its totient is φ = 27536653152.

The previous prime is 29257693981. The next prime is 29257694041. The reversal of 29257693991 is 19939675292.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29257693991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29257693981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 860520395 + ... + 860520428.

It is an arithmetic number, because the mean of its divisors is an integer number (7744683708).

Almost surely, 2^29257693991 is an apocalyptic number.

29257693991 is a deficient number, since it is larger than the sum of its proper divisors (1721040841).

29257693991 is a wasteful number, since it uses less digits than its factorization.

29257693991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721040840.

The product of its digits is 16533720, while the sum is 62.

The spelling of 29257693991 in words is "twenty-nine billion, two hundred fifty-seven million, six hundred ninety-three thousand, nine hundred ninety-one".