9491278721949 has 48 divisors (see below), whose sum is σ = 14250564686592. Its totient is φ = 6083171702784.

The previous prime is 9491278721909. The next prime is 9491278721987.

9491278721949 is a `hidden beast` number, since 9 + 491 + 2 + 7 + 87 + 2 + 19 + 49 = 666.

9491278721949 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9491278721949 - 2¹⁵ = 9491278689181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9491278721909) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9530017 + ... + 10478729.

It is an arithmetic number, because the mean of its divisors is an integer number (296886764304).

Almost surely, 2^{9491278721949} is an apocalyptic number.

It is an amenable number.

9491278721949 is a deficient number, since it is larger than the sum of its proper divisors (4759285964643).

9491278721949 is a wasteful number, since it uses less digits than its factorization.

9491278721949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949186 (or 949183 counting only the distinct ones).

The product of its digits is 164602368, while the sum is 72.

The spelling of 9491278721949 in words is "nine trillion, four hundred ninety-one billion, two hundred seventy-eight million, seven hundred twenty-one thousand, nine hundred forty-nine".