391281151 has 2 divisors, whose sum is σ = 391281152. Its totient is φ = 391281150.

The previous prime is 391281127. The next prime is 391281161. The reversal of 391281151 is 151182193.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 391281151 - 2⁹ = 391280639 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391281161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195640575 + 195640576.

It is an arithmetic number, because the mean of its divisors is an integer number (195640576).

Almost surely, 2^391281151 is an apocalyptic number.

391281151 is a deficient number, since it is larger than the sum of its proper divisors (1).

391281151 is an equidigital number, since it uses as much as digits as its factorization.

391281151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 31.

The square root of 391281151 is about 19780.8278643741. The cubic root of 391281151 is about 731.4135063211.

The spelling of 391281151 in words is "three hundred ninety-one million, two hundred eighty-one thousand, one hundred fifty-one".