391073 has 2 divisors, whose sum is σ = 391074. Its totient is φ = 391072.

The previous prime is 391067. The next prime is 391103. The reversal of 391073 is 370193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 305809 + 85264 = 553^2 + 292^2 .

It is an emirp because it is prime and its reverse (370193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 391073 - 2⁴ = 391057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (391063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195536 + 195537.

It is an arithmetic number, because the mean of its divisors is an integer number (195537).

2³⁹¹⁰⁷³ is an apocalyptic number.

It is an amenable number.

391073 is a deficient number, since it is larger than the sum of its proper divisors (1).

391073 is an equidigital number, since it uses as much as digits as its factorization.

391073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 23.

The square root of 391073 is about 625.3582972984. The cubic root of 391073 is about 73.1283785908.

The spelling of 391073 in words is "three hundred ninety-one thousand, seventy-three".