391050613 has 2 divisors, whose sum is σ = 391050614. Its totient is φ = 391050612.

The previous prime is 391050607. The next prime is 391050629. The reversal of 391050613 is 316050193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 381303729 + 9746884 = 19527^2 + 3122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391050613 is a prime.

It is equal to p_20884141 and since 391050613 and 20884141 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391050683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195525306 + 195525307.

It is an arithmetic number, because the mean of its divisors is an integer number (195525307).

Almost surely, 2^391050613 is an apocalyptic number.

It is an amenable number.

391050613 is a deficient number, since it is larger than the sum of its proper divisors (1).

391050613 is an equidigital number, since it uses as much as digits as its factorization.

391050613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 391050613 is about 19774.9996965866. Note that the first 3 decimals coincide. The cubic root of 391050613 is about 731.2698315122.

The spelling of 391050613 in words is "three hundred ninety-one million, fifty thousand, six hundred thirteen".