391160961 has 32 divisors (see below), whose sum is σ = 631056000. Its totient is φ = 238521024.

The previous prime is 391160953. The next prime is 391160969. The reversal of 391160961 is 169061193.

391160961 is a `hidden beast` number, since 39 + 11 + 609 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (391160953) and next prime (391160969).

It is not a de Polignac number, because 391160961 - 2³ = 391160953 is a prime.

It is a super-4 number, since 4×391160961⁴ (a number of 35 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (391160969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1731 + ... + 28023.

It is an arithmetic number, because the mean of its divisors is an integer number (19720500).

Almost surely, 2^391160961 is an apocalyptic number.

It is an amenable number.

391160961 is a deficient number, since it is larger than the sum of its proper divisors (239895039).

391160961 is a wasteful number, since it uses less digits than its factorization.

391160961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26350 (or 26344 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 391160961 is about 19777.7895883236. The cubic root of 391160961 is about 731.3386091177.

The spelling of 391160961 in words is "three hundred ninety-one million, one hundred sixty thousand, nine hundred sixty-one".