146728909 has 2 divisors, whose sum is σ = 146728910. Its totient is φ = 146728908.

The previous prime is 146728889. The next prime is 146728913. The reversal of 146728909 is 909827641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144072009 + 2656900 = 12003^2 + 1630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-146728909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146728919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73364454 + 73364455.

It is an arithmetic number, because the mean of its divisors is an integer number (73364455).

Almost surely, 2^146728909 is an apocalyptic number.

It is an amenable number.

146728909 is a deficient number, since it is larger than the sum of its proper divisors (1).

146728909 is an equidigital number, since it uses as much as digits as its factorization.

146728909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 146728909 is about 12113.1708895731. The cubic root of 146728909 is about 527.4385831777.

The spelling of 146728909 in words is "one hundred forty-six million, seven hundred twenty-eight thousand, nine hundred nine".