391253461 has 2 divisors, whose sum is σ = 391253462. Its totient is φ = 391253460.

The previous prime is 391253417. The next prime is 391253509. The reversal of 391253461 is 164352193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315737361 + 75516100 = 17769^2 + 8690^2 .

It is a cyclic number.

It is not a de Polignac number, because 391253461 - 2¹³ = 391245269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391253561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195626730 + 195626731.

It is an arithmetic number, because the mean of its divisors is an integer number (195626731).

Almost surely, 2^391253461 is an apocalyptic number.

It is an amenable number.

391253461 is a deficient number, since it is larger than the sum of its proper divisors (1).

391253461 is an equidigital number, since it uses as much as digits as its factorization.

391253461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 391253461 is about 19780.1279318411. The cubic root of 391253461 is about 731.3962524720.

The spelling of 391253461 in words is "three hundred ninety-one million, two hundred fifty-three thousand, four hundred sixty-one".