145231409 has 2 divisors, whose sum is σ = 145231410. Its totient is φ = 145231408.

The previous prime is 145231397. The next prime is 145231433. The reversal of 145231409 is 904132541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141610000 + 3621409 = 11900^2 + 1903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145231409 is a prime.

It is not a weakly prime, because it can be changed into another prime (145231439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72615704 + 72615705.

It is an arithmetic number, because the mean of its divisors is an integer number (72615705).

Almost surely, 2^145231409 is an apocalyptic number.

It is an amenable number.

145231409 is a deficient number, since it is larger than the sum of its proper divisors (1).

145231409 is an equidigital number, since it uses as much as digits as its factorization.

145231409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 145231409 is about 12051.1994838688. The cubic root of 145231409 is about 525.6381162958.

The spelling of 145231409 in words is "one hundred forty-five million, two hundred thirty-one thousand, four hundred nine".