1651225 has 9 divisors (see below), whose sum is σ = 2055517. Its totient is φ = 1315840.

The previous prime is 1651219. The next prime is 1651229. The reversal of 1651225 is 5221561.

The square root of 1651225 is 1285.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 405769 + 1245456 = 637^2 + 1116^2 .

It is not a de Polignac number, because 1651225 - 2¹⁵ = 1618457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1651196 and 1651205.

It is not an unprimeable number, because it can be changed into a prime (1651229) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6297 + ... + 6553.

2^1651225 is an apocalyptic number.

1651225 is the 1285-th square number.

1651225 is the 643-rd centered octagonal number.

It is an amenable number.

1651225 is a deficient number, since it is larger than the sum of its proper divisors (404292).

1651225 is an frugal number, since it uses more digits than its factorization.

1651225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524 (or 262 counting only the distinct ones).

The product of its digits is 600, while the sum is 22.

The cubic root of 1651225 is about 118.1958110561.

Adding to 1651225 its reverse (5221561), we get a palindrome (6872786).

The spelling of 1651225 in words is "one million, six hundred fifty-one thousand, two hundred twenty-five".