309589145 has 4 divisors (see below), whose sum is σ = 371506980. Its totient is φ = 247671312.

The previous prime is 309589129. The next prime is 309589153. The reversal of 309589145 is 541985903.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541985903 = 1223 ⋅443161.

It can be written as a sum of positive squares in 2 ways, for example, as 84198976 + 225390169 = 9176^2 + 15013^2 .

It is a cyclic number.

It is not a de Polignac number, because 309589145 - 2⁴ = 309589129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 309589096 and 309589105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30958910 + ... + 30958919.

It is an arithmetic number, because the mean of its divisors is an integer number (92876745).

Almost surely, 2^309589145 is an apocalyptic number.

It is an amenable number.

309589145 is a deficient number, since it is larger than the sum of its proper divisors (61917835).

309589145 is an equidigital number, since it uses as much as digits as its factorization.

309589145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61917834.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 309589145 is about 17595.1454952780. The cubic root of 309589145 is about 676.4908210539.

The spelling of 309589145 in words is "three hundred nine million, five hundred eighty-nine thousand, one hundred forty-five".