145305917 has 4 divisors (see below), whose sum is σ = 145541280. Its totient is φ = 145070556.

The previous prime is 145305887. The next prime is 145305929. The reversal of 145305917 is 719503541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145305917 - 2¹⁴ = 145289533 is a prime.

It is a super-2 number, since 2×145305917² = 42227619030421778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145305997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116753 + ... + 117990.

It is an arithmetic number, because the mean of its divisors is an integer number (36385320).

Almost surely, 2^145305917 is an apocalyptic number.

It is an amenable number.

145305917 is a deficient number, since it is larger than the sum of its proper divisors (235363).

145305917 is an equidigital number, since it uses as much as digits as its factorization.

145305917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235362.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 145305917 is about 12054.2903980284. The cubic root of 145305917 is about 525.7279902184.

The spelling of 145305917 in words is "one hundred forty-five million, three hundred five thousand, nine hundred seventeen".