145820117 has 4 divisors (see below), whose sum is σ = 153494880. Its totient is φ = 138145356.

The previous prime is 145820113. The next prime is 145820131. The reversal of 145820117 is 711028541.

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: 711028541 = 73 ⋅9740117.

It is a cyclic number.

It is not a de Polignac number, because 145820117 - 2² = 145820113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145820117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145820113) 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, 3837353 + ... + 3837390.

It is an arithmetic number, because the mean of its divisors is an integer number (38373720).

Almost surely, 2^145820117 is an apocalyptic number.

It is an amenable number.

145820117 is a deficient number, since it is larger than the sum of its proper divisors (7674763).

145820117 is an equidigital number, since it uses as much as digits as its factorization.

145820117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7674762.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 145820117 is about 12075.6000679055. The cubic root of 145820117 is about 526.3473985407.

Adding to 145820117 its reverse (711028541), we get a palindrome (856848658).

The spelling of 145820117 in words is "one hundred forty-five million, eight hundred twenty thousand, one hundred seventeen".