1218125 has 10 divisors (see below), whose sum is σ = 1522950. Its totient is φ = 974000.

The previous prime is 1218121. The next prime is 1218131. The reversal of 1218125 is 5218121.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 292681 + 925444 = 541^2 + 962^2 .

It is not a de Polignac number, because 1218125 - 2² = 1218121 is a prime.

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

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1218097 and 1218106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218121) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 350 + ... + 1599.

It is an arithmetic number, because the mean of its divisors is an integer number (152295).

2^1218125 is an apocalyptic number.

It is an amenable number.

1218125 is a deficient number, since it is larger than the sum of its proper divisors (304825).

1218125 is an frugal number, since it uses more digits than its factorization.

1218125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969 (or 1954 counting only the distinct ones).

The product of its digits is 160, while the sum is 20.

The square root of 1218125 is about 1103.6870027322. The cubic root of 1218125 is about 106.7982046952.

The spelling of 1218125 in words is "one million, two hundred eighteen thousand, one hundred twenty-five".