145520915 has 4 divisors (see below), whose sum is σ = 174625104. Its totient is φ = 116416728.

The previous prime is 145520911. The next prime is 145520917. The reversal of 145520915 is 519025541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 145520915 - 2² = 145520911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145520911) 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, 14552087 + ... + 14552096.

It is an arithmetic number, because the mean of its divisors is an integer number (43656276).

Almost surely, 2^145520915 is an apocalyptic number.

145520915 is a deficient number, since it is larger than the sum of its proper divisors (29104189).

145520915 is an equidigital number, since it uses as much as digits as its factorization.

145520915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29104188.

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 145520915 is about 12063.2050053044. The cubic root of 145520915 is about 525.9871555413.

The spelling of 145520915 in words is "one hundred forty-five million, five hundred twenty thousand, nine hundred fifteen".