391300061 has 4 divisors (see below), whose sum is σ = 391346172. Its totient is φ = 391253952.

The previous prime is 391300057. The next prime is 391300093. The reversal of 391300061 is 160003193.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14707225 + 376592836 = 3835^2 + 19406^2 .

It is a cyclic number.

It is not a de Polignac number, because 391300061 - 2² = 391300057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391300031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6236 + ... + 28661.

It is an arithmetic number, because the mean of its divisors is an integer number (97836543).

Almost surely, 2^391300061 is an apocalyptic number.

It is an amenable number.

391300061 is a deficient number, since it is larger than the sum of its proper divisors (46111).

391300061 is a wasteful number, since it uses less digits than its factorization.

391300061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46110.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 391300061 is about 19781.3058466826. The cubic root of 391300061 is about 731.4252888178.

The spelling of 391300061 in words is "three hundred ninety-one million, three hundred thousand, sixty-one".