145326809 has 2 divisors, whose sum is σ = 145326810. Its totient is φ = 145326808.

The previous prime is 145326803. The next prime is 145326823. The reversal of 145326809 is 908623541.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125328025 + 19998784 = 11195^2 + 4472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145326809 is a prime.

It is a super-2 number, since 2×145326809² = 42239762828244962, which contains 22 as substring.

It is equal to p_8195942 and since 145326809 and 8195942 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (145326803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72663404 + 72663405.

It is an arithmetic number, because the mean of its divisors is an integer number (72663405).

Almost surely, 2^145326809 is an apocalyptic number.

It is an amenable number.

145326809 is a deficient number, since it is larger than the sum of its proper divisors (1).

145326809 is an equidigital number, since it uses as much as digits as its factorization.

145326809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 145326809 is about 12055.1569463031. The cubic root of 145326809 is about 525.7531852988.

The spelling of 145326809 in words is "one hundred forty-five million, three hundred twenty-six thousand, eight hundred nine".