145651689 has 20 divisors (see below), whose sum is σ = 219517716. Its totient is φ = 96235776.

The previous prime is 145651679. The next prime is 145651691. The reversal of 145651689 is 986156541.

145651689 is a `hidden beast` number, since 1 + 4 + 56 + 516 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 50296464 + 95355225 = 7092^2 + 9765^2 .

It is not a de Polignac number, because 145651689 - 2¹⁶ = 145586153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145651669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1197 + ... + 17109.

Almost surely, 2^145651689 is an apocalyptic number.

It is an amenable number.

145651689 is a deficient number, since it is larger than the sum of its proper divisors (73866027).

145651689 is a wasteful number, since it uses less digits than its factorization.

145651689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16038 (or 16029 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 145651689 is about 12068.6241552217. The cubic root of 145651689 is about 526.1446697828.

The spelling of 145651689 in words is "one hundred forty-five million, six hundred fifty-one thousand, six hundred eighty-nine".