391133 has 2 divisors, whose sum is σ = 391134. Its totient is φ = 391132.

The previous prime is 391117. The next prime is 391151. The reversal of 391133 is 331193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252004 + 139129 = 502^2 + 373^2 .

It is a cyclic number.

It is not a de Polignac number, because 391133 - 2⁴ = 391117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195566 + 195567.

It is an arithmetic number, because the mean of its divisors is an integer number (195567).

2³⁹¹¹³³ is an apocalyptic number.

It is an amenable number.

391133 is a deficient number, since it is larger than the sum of its proper divisors (1).

391133 is an equidigital number, since it uses as much as digits as its factorization.

391133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 243, while the sum is 20.

The square root of 391133 is about 625.4062679571. The cubic root of 391133 is about 73.1321182834.

It can be divided in two parts, 391 and 133, that multiplied together give a triangular number (52003 = T₃₂₂).

The spelling of 391133 in words is "three hundred ninety-one thousand, one hundred thirty-three".