1553425 has 6 divisors (see below), whose sum is σ = 1926278. Its totient is φ = 1242720.

The previous prime is 1553423. The next prime is 1553429. The reversal of 1553425 is 5243551.

It can be written as a sum of positive squares in 3 ways, for example, as 278784 + 1274641 = 528^2 + 1129^2 .

It is not a de Polignac number, because 1553425 - 2¹ = 1553423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 62137 = 1553425 / (1 + 5 + 5 + 3 + 4 + 2 + 5).

It is a Duffinian number.

1553425 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1553425.

It is not an unprimeable number, because it can be changed into a prime (1553423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31044 + ... + 31093.

2^1553425 is an apocalyptic number.

It is an amenable number.

1553425 is a deficient number, since it is larger than the sum of its proper divisors (372853).

1553425 is an equidigital number, since it uses as much as digits as its factorization.

1553425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62147 (or 62142 counting only the distinct ones).

The product of its digits is 3000, while the sum is 25.

The square root of 1553425 is about 1246.3647138779. The cubic root of 1553425 is about 115.8146316039.

Adding to 1553425 its reverse (5243551), we get a palindrome (6796976).

The spelling of 1553425 in words is "one million, five hundred fifty-three thousand, four hundred twenty-five".