9945454691 has 4 divisors (see below), whose sum is σ = 9948511512. Its totient is φ = 9942397872.

The previous prime is 9945454663. The next prime is 9945454703. The reversal of 9945454691 is 1964545499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1964545499 = 7 ⋅280649357.

It is a cyclic number.

It is not a de Polignac number, because 9945454691 - 2¹⁸ = 9945192547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9945454591) 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, 1523525 + ... + 1530038.

It is an arithmetic number, because the mean of its divisors is an integer number (2487127878).

Almost surely, 2^9945454691 is an apocalyptic number.

9945454691 is a deficient number, since it is larger than the sum of its proper divisors (3056821).

9945454691 is a wasteful number, since it uses less digits than its factorization.

9945454691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3056820.

The product of its digits is 6998400, while the sum is 56.

The square root of 9945454691 is about 99726.9005384204. The cubic root of 9945454691 is about 2150.5104027814.

The spelling of 9945454691 in words is "nine billion, nine hundred forty-five million, four hundred fifty-four thousand, six hundred ninety-one".