591278961 has 16 divisors (see below), whose sum is σ = 970304384. Its totient is φ = 311883264.

The previous prime is 591278959. The next prime is 591278977. The reversal of 591278961 is 169872195.

It is not a de Polignac number, because 591278961 - 2¹ = 591278959 is a prime.

It is a super-2 number, since 2×591278961² = 699221619442479042, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 591278961.

It is not an unprimeable number, because it can be changed into a prime (591278951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1082656 + ... + 1083201.

It is an arithmetic number, because the mean of its divisors is an integer number (60644024).

Almost surely, 2^591278961 is an apocalyptic number.

It is an amenable number.

591278961 is a deficient number, since it is larger than the sum of its proper divisors (379025423).

591278961 is a wasteful number, since it uses less digits than its factorization.

591278961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165880.

The product of its digits is 272160, while the sum is 48.

The square root of 591278961 is about 24316.2283465179. The cubic root of 591278961 is about 839.3262553844.

The spelling of 591278961 in words is "five hundred ninety-one million, two hundred seventy-eight thousand, nine hundred sixty-one".