145638017 has 4 divisors (see below), whose sum is σ = 166443456. Its totient is φ = 124832580.

The previous prime is 145637959. The next prime is 145638023. The reversal of 145638017 is 710836541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 710836541 = 31 ⋅22930211.

It is a cyclic number.

It is not a de Polignac number, because 145638017 - 2⁶ = 145637953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145638917) 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, 10402709 + ... + 10402722.

It is an arithmetic number, because the mean of its divisors is an integer number (41610864).

Almost surely, 2^145638017 is an apocalyptic number.

It is an amenable number.

145638017 is a deficient number, since it is larger than the sum of its proper divisors (20805439).

145638017 is an equidigital number, since it uses as much as digits as its factorization.

145638017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20805438.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 145638017 is about 12068.0577144792. The cubic root of 145638017 is about 526.1282065911.

The spelling of 145638017 in words is "one hundred forty-five million, six hundred thirty-eight thousand, seventeen".