70145 has 4 divisors (see below), whose sum is σ = 84180. Its totient is φ = 56112.

The previous prime is 70141. The next prime is 70157. The reversal of 70145 is 54107.

70145 = T₁₆₅ + T₁₆₆ + ... + T₁₆₉.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54107 = 61 ⋅887.

It can be written as a sum of positive squares in 2 ways, for example, as 10609 + 59536 = 103^2 + 244^2 .

It is a cyclic number.

It is not a de Polignac number, because 70145 - 2² = 70141 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (70141) 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, 7010 + ... + 7019.

It is an arithmetic number, because the mean of its divisors is an integer number (21045).

It is a Proth number, since it is equal to 137 ⋅ 2⁹ + 1 and 137 < 2⁹.

2⁷⁰¹⁴⁵ is an apocalyptic number.

It is an amenable number.

70145 is a deficient number, since it is larger than the sum of its proper divisors (14035).

70145 is a wasteful number, since it uses less digits than its factorization.

70145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14034.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 70145 is about 264.8490135908. The cubic root of 70145 is about 41.2412898659.

The spelling of 70145 in words is "seventy thousand, one hundred forty-five".