145887317 has 4 divisors (see below), whose sum is σ = 145930476. Its totient is φ = 145844160.

The previous prime is 145887283. The next prime is 145887397. The reversal of 145887317 is 713788541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 713788541 = 269 ⋅2653489.

It can be written as a sum of positive squares in 2 ways, for example, as 26946481 + 118940836 = 5191^2 + 10906^2 .

It is a cyclic number.

It is not a de Polignac number, because 145887317 - 2⁶ = 145887253 is a prime.

It is a super-2 number, since 2×145887317² = 42566218522916978, 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 (145887397) 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, 16034 + ... + 23427.

It is an arithmetic number, because the mean of its divisors is an integer number (36482619).

Almost surely, 2^145887317 is an apocalyptic number.

It is an amenable number.

145887317 is a deficient number, since it is larger than the sum of its proper divisors (43159).

145887317 is an equidigital number, since it uses as much as digits as its factorization.

145887317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43158.

The product of its digits is 188160, while the sum is 44.

The square root of 145887317 is about 12078.3822178303. The cubic root of 145887317 is about 526.4282404115.

The spelling of 145887317 in words is "one hundred forty-five million, eight hundred eighty-seven thousand, three hundred seventeen".