146686391 has 2 divisors, whose sum is σ = 146686392. Its totient is φ = 146686390.

The previous prime is 146686367. The next prime is 146686399. The reversal of 146686391 is 193686641.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (193686641) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-146686391 is a prime.

It is a super-3 number, since 3×146686391³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146686399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73343195 + 73343196.

It is an arithmetic number, because the mean of its divisors is an integer number (73343196).

Almost surely, 2^146686391 is an apocalyptic number.

146686391 is a deficient number, since it is larger than the sum of its proper divisors (1).

146686391 is an equidigital number, since it uses as much as digits as its factorization.

146686391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 146686391 is about 12111.4157306237. The cubic root of 146686391 is about 527.3876325270.

The spelling of 146686391 in words is "one hundred forty-six million, six hundred eighty-six thousand, three hundred ninety-one".