145981519 has 4 divisors (see below), whose sum is σ = 146027160. Its totient is φ = 145935880.

The previous prime is 145981513. The next prime is 145981523. The reversal of 145981519 is 915189541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 915189541 = 7 ⋅130741363.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145981519 is a prime.

It is a super-4 number, since 4×145981519⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145981513) 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, 17629 + ... + 24550.

It is an arithmetic number, because the mean of its divisors is an integer number (36506790).

Almost surely, 2^145981519 is an apocalyptic number.

145981519 is a deficient number, since it is larger than the sum of its proper divisors (45641).

145981519 is an equidigital number, since it uses as much as digits as its factorization.

145981519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45640.

The product of its digits is 64800, while the sum is 43.

The square root of 145981519 is about 12082.2812001708. The cubic root of 145981519 is about 526.5415240154.

The spelling of 145981519 in words is "one hundred forty-five million, nine hundred eighty-one thousand, five hundred nineteen".