145509515 has 4 divisors (see below), whose sum is σ = 174611424. Its totient is φ = 116407608.

The previous prime is 145509503. The next prime is 145509527. The reversal of 145509515 is 515905541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515905541 = 37 ⋅13943393.

It is an interprime number because it is at equal distance from previous prime (145509503) and next prime (145509527).

It is a cyclic number.

It is not a de Polignac number, because 145509515 - 2⁴ = 145509499 is a prime.

It is a Duffinian number.

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, 14550947 + ... + 14550956.

It is an arithmetic number, because the mean of its divisors is an integer number (43652856).

Almost surely, 2^145509515 is an apocalyptic number.

145509515 is a deficient number, since it is larger than the sum of its proper divisors (29101909).

145509515 is an equidigital number, since it uses as much as digits as its factorization.

145509515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29101908.

The product of its (nonzero) digits is 22500, while the sum is 35.

The square root of 145509515 is about 12062.7324848063. The cubic root of 145509515 is about 525.9734200354.

The spelling of 145509515 in words is "one hundred forty-five million, five hundred nine thousand, five hundred fifteen".