9911775493 has 4 divisors (see below), whose sum is σ = 9911986380. Its totient is φ = 9911564608.

The previous prime is 9911775479. The next prime is 9911775499. The reversal of 9911775493 is 3945771199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3945771199 = 13499 ⋅292301.

It can be written as a sum of positive squares in 2 ways, for example, as 6435729729 + 3476045764 = 80223^2 + 58958^2 .

It is a cyclic number.

It is not a de Polignac number, because 9911775493 - 2²¹ = 9909678341 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 (9911775499) 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, 621 + ... + 140797.

It is an arithmetic number, because the mean of its divisors is an integer number (2477996595).

Almost surely, 2^9911775493 is an apocalyptic number.

It is an amenable number.

9911775493 is a deficient number, since it is larger than the sum of its proper divisors (210887).

9911775493 is a wasteful number, since it uses less digits than its factorization.

9911775493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210886.

The product of its digits is 2143260, while the sum is 55.

The square root of 9911775493 is about 99557.9002038512. The cubic root of 9911775493 is about 2148.0801677989.

The spelling of 9911775493 in words is "nine billion, nine hundred eleven million, seven hundred seventy-five thousand, four hundred ninety-three".