9129997691 has 4 divisors (see below), whose sum is σ = 9146874384. Its totient is φ = 9113121000.

The previous prime is 9129997687. The next prime is 9129997693. The reversal of 9129997691 is 1967999219.

It is a happy number.

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 9129997691 - 2² = 9129997687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9129997693) 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, 8437535 + ... + 8438616.

It is an arithmetic number, because the mean of its divisors is an integer number (2286718596).

Almost surely, 2^9129997691 is an apocalyptic number.

9129997691 is a deficient number, since it is larger than the sum of its proper divisors (16876693).

9129997691 is a wasteful number, since it uses less digits than its factorization.

9129997691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16876692.

The product of its digits is 4960116, while the sum is 62.

The square root of 9129997691 is about 95551.0214021807. The cubic root of 9129997691 is about 2090.0510271189.

The spelling of 9129997691 in words is "nine billion, one hundred twenty-nine million, nine hundred ninety-seven thousand, six hundred ninety-one".