391349143 has 2 divisors, whose sum is σ = 391349144. Its totient is φ = 391349142.

The previous prime is 391349107. The next prime is 391349159. The reversal of 391349143 is 341943193.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 391349143 - 2⁹ = 391348631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391349243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195674571 + 195674572.

It is an arithmetic number, because the mean of its divisors is an integer number (195674572).

Almost surely, 2^391349143 is an apocalyptic number.

391349143 is a deficient number, since it is larger than the sum of its proper divisors (1).

391349143 is an equidigital number, since it uses as much as digits as its factorization.

391349143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 37.

The square root of 391349143 is about 19782.5464235523. The cubic root of 391349143 is about 731.4558691990.

The spelling of 391349143 in words is "three hundred ninety-one million, three hundred forty-nine thousand, one hundred forty-three".