1221925 has 12 divisors (see below), whose sum is σ = 1557316. Its totient is φ = 950400.

The previous prime is 1221917. The next prime is 1221937. The reversal of 1221925 is 5291221.

It can be written as a sum of positive squares in 6 ways, for example, as 136161 + 1085764 = 369^2 + 1042^2 .

It is not a de Polignac number, because 1221925 - 2³ = 1221917 is a prime.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221896 and 1221905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 265 + ... + 1585.

2^1221925 is an apocalyptic number.

It is an amenable number.

1221925 is a deficient number, since it is larger than the sum of its proper divisors (335391).

1221925 is a wasteful number, since it uses less digits than its factorization.

1221925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368 (or 1363 counting only the distinct ones).

The product of its digits is 360, while the sum is 22.

The square root of 1221925 is about 1105.4071648040. The cubic root of 1221925 is about 106.9091434747.

The spelling of 1221925 in words is "one million, two hundred twenty-one thousand, nine hundred twenty-five".