1221725 has 6 divisors (see below), whose sum is σ = 1514970. Its totient is φ = 977360.

The previous prime is 1221707. The next prime is 1221749. The reversal of 1221725 is 5271221.

It can be written as a sum of positive squares in 3 ways, for example, as 13924 + 1207801 = 118^2 + 1099^2 .

It is not a de Polignac number, because 1221725 - 2⁸ = 1221469 is a prime.

It is a super-2 number, since 2×1221725² = 2985223951250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221697 and 1221706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24410 + ... + 24459.

It is an arithmetic number, because the mean of its divisors is an integer number (252495).

2^1221725 is an apocalyptic number.

It is an amenable number.

1221725 is a deficient number, since it is larger than the sum of its proper divisors (293245).

1221725 is an equidigital number, since it uses as much as digits as its factorization.

1221725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48879 (or 48874 counting only the distinct ones).

The product of its digits is 280, while the sum is 20.

The square root of 1221725 is about 1105.3166966983. The cubic root of 1221725 is about 106.9033103301.

Adding to 1221725 its reverse (5271221), we get a palindrome (6492946).

The spelling of 1221725 in words is "one million, two hundred twenty-one thousand, seven hundred twenty-five".