145118861 has 4 divisors (see below), whose sum is σ = 146749500. Its totient is φ = 143488224.

The previous prime is 145118821. The next prime is 145118867. The reversal of 145118861 is 168811541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168811541 = 103 ⋅1638947.

It can be written as a sum of positive squares in 2 ways, for example, as 66015625 + 79103236 = 8125^2 + 8894^2 .

It is a cyclic number.

It is not a de Polignac number, because 145118861 - 2¹⁰ = 145117837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145118867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815186 + ... + 815363.

It is an arithmetic number, because the mean of its divisors is an integer number (36687375).

Almost surely, 2^145118861 is an apocalyptic number.

It is an amenable number.

145118861 is a deficient number, since it is larger than the sum of its proper divisors (1630639).

145118861 is an equidigital number, since it uses as much as digits as its factorization.

145118861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630638.

The product of its digits is 7680, while the sum is 35.

The square root of 145118861 is about 12046.5290021649. The cubic root of 145118861 is about 525.5022990101.

The spelling of 145118861 in words is "one hundred forty-five million, one hundred eighteen thousand, eight hundred sixty-one".