9145387791 has 24 divisors (see below), whose sum is σ = 13882565840. Its totient is φ = 5794177536.

The previous prime is 9145387789. The next prime is 9145387831. The reversal of 9145387791 is 1977835419.

It is a happy number.

9145387791 is a `hidden beast` number, since 9 + 14 + 538 + 7 + 7 + 91 = 666.

It is not a de Polignac number, because 9145387791 - 2¹ = 9145387789 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 (9145387721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 305026 + ... + 333663.

Almost surely, 2^9145387791 is an apocalyptic number.

9145387791 is a deficient number, since it is larger than the sum of its proper divisors (4737178049).

9145387791 is a wasteful number, since it uses less digits than its factorization.

9145387791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638775 (or 638772 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 9145387791 is about 95631.5209070733. The cubic root of 9145387791 is about 2091.2247418183.

The spelling of 9145387791 in words is "nine billion, one hundred forty-five million, three hundred eighty-seven thousand, seven hundred ninety-one".