391037089 has 2 divisors, whose sum is σ = 391037090. Its totient is φ = 391037088.

The previous prime is 391037063. The next prime is 391037093. The reversal of 391037089 is 980730193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 377641489 + 13395600 = 19433^2 + 3660^2 .

It is an emirp because it is prime and its reverse (980730193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 391037089 - 2⁹ = 391036577 is a prime.

It is a Chen prime.

It is equal to p_20883487 and since 391037089 and 20883487 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (391037029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195518544 + 195518545.

It is an arithmetic number, because the mean of its divisors is an integer number (195518545).

Almost surely, 2^391037089 is an apocalyptic number.

It is an amenable number.

391037089 is a deficient number, since it is larger than the sum of its proper divisors (1).

391037089 is an equidigital number, since it uses as much as digits as its factorization.

391037089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 391037089 is about 19774.6577467222. The cubic root of 391037089 is about 731.2614013953.

The spelling of 391037089 in words is "three hundred ninety-one million, thirty-seven thousand, eighty-nine".