145961217 has 8 divisors (see below), whose sum is σ = 216238880. Its totient is φ = 97307460.

The previous prime is 145961209. The next prime is 145961239. The reversal of 145961217 is 712169541.

It is not a de Polignac number, because 145961217 - 2³ = 145961209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145961267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2702959 + ... + 2703012.

It is an arithmetic number, because the mean of its divisors is an integer number (27029860).

Almost surely, 2^145961217 is an apocalyptic number.

It is an amenable number.

145961217 is a deficient number, since it is larger than the sum of its proper divisors (70277663).

145961217 is an equidigital number, since it uses as much as digits as its factorization.

145961217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5405980 (or 5405974 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 145961217 is about 12081.4410150445. The cubic root of 145961217 is about 526.5171137529.

The spelling of 145961217 in words is "one hundred forty-five million, nine hundred sixty-one thousand, two hundred seventeen".