1525145 has 4 divisors (see below), whose sum is σ = 1830180. Its totient is φ = 1220112.

The previous prime is 1525133. The next prime is 1525157. The reversal of 1525145 is 5415251.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5415251 = 509 ⋅10639.

It is an interprime number because it is at equal distance from previous prime (1525133) and next prime (1525157).

It can be written as a sum of positive squares in 2 ways, for example, as 399424 + 1125721 = 632^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1525145 - 2¹² = 1521049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1525145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152510 + ... + 152519.

It is an arithmetic number, because the mean of its divisors is an integer number (457545).

2^1525145 is an apocalyptic number.

It is an amenable number.

1525145 is a deficient number, since it is larger than the sum of its proper divisors (305035).

1525145 is an equidigital number, since it uses as much as digits as its factorization.

1525145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305034.

The product of its digits is 1000, while the sum is 23.

The square root of 1525145 is about 1234.9676109113. The cubic root of 1525145 is about 115.1075238835.

The spelling of 1525145 in words is "one million, five hundred twenty-five thousand, one hundred forty-five".