391474229 has 2 divisors, whose sum is σ = 391474230. Its totient is φ = 391474228.

The previous prime is 391474217. The next prime is 391474241. The reversal of 391474229 is 922474193.

It is a balanced prime because it is at equal distance from previous prime (391474217) and next prime (391474241).

It can be written as a sum of positive squares in only one way, i.e., 367757329 + 23716900 = 19177^2 + 4870^2 .

It is an emirp because it is prime and its reverse (922474193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 391474229 - 2²⁰ = 390425653 is a prime.

It is a super-2 number, since 2×391474229² = 306504143942288882, which contains 22 as substring.

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 (391404229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195737114 + 195737115.

It is an arithmetic number, because the mean of its divisors is an integer number (195737115).

Almost surely, 2^391474229 is an apocalyptic number.

It is an amenable number.

391474229 is a deficient number, since it is larger than the sum of its proper divisors (1).

391474229 is an equidigital number, since it uses as much as digits as its factorization.

391474229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The square root of 391474229 is about 19785.7076952026. The cubic root of 391474229 is about 731.5337920667.

The spelling of 391474229 in words is "three hundred ninety-one million, four hundred seventy-four thousand, two hundred twenty-nine".