145688689 has 4 divisors (see below), whose sum is σ = 145850224. Its totient is φ = 145527156.

The previous prime is 145688671. The next prime is 145688701. The reversal of 145688689 is 986886541.

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.

It is a cyclic number.

It is not a de Polignac number, because 145688689 - 2¹¹ = 145686641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145685689) 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, 79407 + ... + 81220.

It is an arithmetic number, because the mean of its divisors is an integer number (36462556).

Almost surely, 2^145688689 is an apocalyptic number.

It is an amenable number.

145688689 is a deficient number, since it is larger than the sum of its proper divisors (161535).

145688689 is an equidigital number, since it uses as much as digits as its factorization.

145688689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161534.

The product of its digits is 3317760, while the sum is 55.

The square root of 145688689 is about 12070.1569583829. The cubic root of 145688689 is about 526.1892183097.

The spelling of 145688689 in words is "one hundred forty-five million, six hundred eighty-eight thousand, six hundred eighty-nine".