1221125 has 8 divisors (see below), whose sum is σ = 1524120. Its totient is φ = 976800.

The previous prime is 1221119. The next prime is 1221131. The reversal of 1221125 is 5211221.

It is an interprime number because it is at equal distance from previous prime (1221119) and next prime (1221131).

It can be written as a sum of positive squares in 4 ways, for example, as 101761 + 1119364 = 319^2 + 1058^2 .

It is not a de Polignac number, because 1221125 - 2⁶ = 1221061 is a prime.

It is a super-2 number, since 2×1221125² = 2982292531250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4760 + ... + 5009.

It is an arithmetic number, because the mean of its divisors is an integer number (190515).

2^1221125 is an apocalyptic number.

It is an amenable number.

1221125 is a deficient number, since it is larger than the sum of its proper divisors (302995).

1221125 is an frugal number, since it uses more digits than its factorization.

1221125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9784 (or 9774 counting only the distinct ones).

The product of its digits is 40, while the sum is 14.

The square root of 1221125 is about 1105.0452479424. The cubic root of 1221125 is about 106.8858070761.

Adding to 1221125 its reverse (5211221), we get a palindrome (6432346).

The spelling of 1221125 in words is "one million, two hundred twenty-one thousand, one hundred twenty-five".