145309390609 has 4 divisors (see below), whose sum is σ = 145322228260. Its totient is φ = 145296552960.

The previous prime is 145309390601. The next prime is 145309390613. The reversal of 145309390609 is 906093903541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24010432209 + 121298958400 = 154953^2 + 348280^2 .

It is a cyclic number.

It is not a de Polignac number, because 145309390609 - 2³ = 145309390601 is a prime.

It is a super-2 number, since 2×145309390609² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145309390601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6401832 + ... + 6424489.

It is an arithmetic number, because the mean of its divisors is an integer number (36330557065).

Almost surely, 2^145309390609 is an apocalyptic number.

It is an amenable number.

145309390609 is a deficient number, since it is larger than the sum of its proper divisors (12837651).

145309390609 is a wasteful number, since it uses less digits than its factorization.

145309390609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12837650.

The product of its (nonzero) digits is 787320, while the sum is 49.

The spelling of 145309390609 in words is "one hundred forty-five billion, three hundred nine million, three hundred ninety thousand, six hundred nine".