1251521 has 4 divisors (see below), whose sum is σ = 1255044. Its totient is φ = 1248000.

The previous prime is 1251463. The next prime is 1251527.

1251521 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 579121 + 672400 = 761^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251521 - 2¹⁰ = 1250497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1251521.

It is not an unprimeable number, because it can be changed into a prime (1251527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1160 + ... + 1961.

It is an arithmetic number, because the mean of its divisors is an integer number (313761).

2^1251521 is an apocalyptic number.

It is an amenable number.

1251521 is a deficient number, since it is larger than the sum of its proper divisors (3523).

1251521 is an equidigital number, since it uses as much as digits as its factorization.

1251521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3522.

The product of its digits is 100, while the sum is 17.

The square root of 1251521 is about 1118.7139938340. The cubic root of 1251521 is about 107.7654087276.

The spelling of 1251521 in words is "one million, two hundred fifty-one thousand, five hundred twenty-one".