145172005 has 8 divisors (see below), whose sum is σ = 190043424. Its totient is φ = 105579600.

The previous prime is 145172003. The next prime is 145172023. The reversal of 145172005 is 500271541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 145172005 - 2¹ = 145172003 is a prime.

It is a super-2 number, since 2×145172005² = 42149822071440050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145172003) 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, 1319691 + ... + 1319800.

It is an arithmetic number, because the mean of its divisors is an integer number (23755428).

Almost surely, 2^145172005 is an apocalyptic number.

It is an amenable number.

145172005 is a deficient number, since it is larger than the sum of its proper divisors (44871419).

145172005 is a wasteful number, since it uses less digits than its factorization.

145172005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639507.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 145172005 is about 12048.7345808595. The cubic root of 145172005 is about 525.5664392733.

The spelling of 145172005 in words is "one hundred forty-five million, one hundred seventy-two thousand, five".