145691 has 8 divisors (see below), whose sum is σ = 179424. Its totient is φ = 115200.

The previous prime is 145687. The next prime is 145703. The reversal of 145691 is 196541.

145691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145691 - 2² = 145687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145691.

It is not an unprimeable number, because it can be changed into a prime (145601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710 + ... + 891.

It is an arithmetic number, because the mean of its divisors is an integer number (22428).

2¹⁴⁵⁶⁹¹ is an apocalyptic number.

145691 is a deficient number, since it is larger than the sum of its proper divisors (33733).

145691 is a wasteful number, since it uses less digits than its factorization.

145691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621.

The product of its digits is 1080, while the sum is 26.

The square root of 145691 is about 381.6949043412. The cubic root of 145691 is about 52.6192000536.

It can be divided in two parts, 1456 and 91, that multiplied together give a square (132496 = 364²).

The spelling of 145691 in words is "one hundred forty-five thousand, six hundred ninety-one".