654145 has 4 divisors (see below), whose sum is σ = 784980. Its totient is φ = 523312.

The previous prime is 654127. The next prime is 654149. The reversal of 654145 is 541456.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 152881 + 501264 = 391^2 + 708^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654145 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65410 + ... + 65419.

It is an arithmetic number, because the mean of its divisors is an integer number (196245).

2⁶⁵⁴¹⁴⁵ is an apocalyptic number.

It is an amenable number.

654145 is a deficient number, since it is larger than the sum of its proper divisors (130835).

654145 is a wasteful number, since it uses less digits than its factorization.

654145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130834.

The product of its digits is 2400, while the sum is 25.

The square root of 654145 is about 808.7923095579. The cubic root of 654145 is about 86.8076518557.

It can be divided in two parts, 654 and 145, that multiplied together give a triangular number (94830 = T₄₃₅).

The spelling of 654145 in words is "six hundred fifty-four thousand, one hundred forty-five".