9129125691 has 12 divisors (see below), whose sum is σ = 15070302832. Its totient is φ = 5216643216.

The previous prime is 9129125671. The next prime is 9129125771. The reversal of 9129125691 is 1965219219.

It is not a de Polignac number, because 9129125691 - 2⁶ = 9129125627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9129125671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72453316 + ... + 72453441.

Almost surely, 2^9129125691 is an apocalyptic number.

9129125691 is a deficient number, since it is larger than the sum of its proper divisors (5941177141).

9129125691 is a wasteful number, since it uses less digits than its factorization.

9129125691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144906770 (or 144906767 counting only the distinct ones).

The product of its digits is 87480, while the sum is 45.

The square root of 9129125691 is about 95546.4582860087. The cubic root of 9129125691 is about 2089.9844852064.

The spelling of 9129125691 in words is "nine billion, one hundred twenty-nine million, one hundred twenty-five thousand, six hundred ninety-one".