29070861991 has 4 divisors (see below), whose sum is σ = 29086916184. Its totient is φ = 29054807800.

The previous prime is 29070861979. The next prime is 29070862003. The reversal of 29070861991 is 19916807092.

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

It is an interprime number because it is at equal distance from previous prime (29070861979) and next prime (29070862003).

It is a cyclic number.

It is not a de Polignac number, because 29070861991 - 2⁵ = 29070861959 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 (29070861901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8024380 + ... + 8028001.

It is an arithmetic number, because the mean of its divisors is an integer number (7271729046).

Almost surely, 2^29070861991 is an apocalyptic number.

29070861991 is a deficient number, since it is larger than the sum of its proper divisors (16054193).

29070861991 is a wasteful number, since it uses less digits than its factorization.

29070861991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16054192.

The product of its (nonzero) digits is 489888, while the sum is 52.

The spelling of 29070861991 in words is "twenty-nine billion, seventy million, eight hundred sixty-one thousand, nine hundred ninety-one".