145220865 has 16 divisors (see below), whose sum is σ = 232763328. Its totient is φ = 77314496.

The previous prime is 145220849. The next prime is 145220879. The reversal of 145220865 is 568022541.

It is a cyclic number.

It is not a de Polignac number, because 145220865 - 2⁴ = 145220849 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559 + ... + 17051.

It is an arithmetic number, because the mean of its divisors is an integer number (14547708).

Almost surely, 2^145220865 is an apocalyptic number.

145220865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

145220865 is a deficient number, since it is larger than the sum of its proper divisors (87542463).

145220865 is a wasteful number, since it uses less digits than its factorization.

145220865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17088.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 145220865 is about 12050.7620091013. The cubic root of 145220865 is about 525.6253953046.

The spelling of 145220865 in words is "one hundred forty-five million, two hundred twenty thousand, eight hundred sixty-five".