29990131867 has 4 divisors (see below), whose sum is σ = 31568559880. Its totient is φ = 28411703856.

The previous prime is 29990131841. The next prime is 29990131877. The reversal of 29990131867 is 76813109992.

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

It is a cyclic number.

It is not a de Polignac number, because 29990131867 - 2²⁷ = 29855914139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29990131807) 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, 789213978 + ... + 789214015.

It is an arithmetic number, because the mean of its divisors is an integer number (7892139970).

Almost surely, 2^29990131867 is an apocalyptic number.

29990131867 is a deficient number, since it is larger than the sum of its proper divisors (1578428013).

29990131867 is a wasteful number, since it uses less digits than its factorization.

29990131867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578428012.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The spelling of 29990131867 in words is "twenty-nine billion, nine hundred ninety million, one hundred thirty-one thousand, eight hundred sixty-seven".