1251505 has 4 divisors (see below), whose sum is σ = 1501812. Its totient is φ = 1001200.

The previous prime is 1251463. The next prime is 1251527. The reversal of 1251505 is 5051521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5051521 = 59 ⋅85619.

It can be written as a sum of positive squares in 2 ways, for example, as 772641 + 478864 = 879^2 + 692^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1251505 is a prime.

It is a Duffinian number.

1251505 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125146 + ... + 125155.

It is an arithmetic number, because the mean of its divisors is an integer number (375453).

2^1251505 is an apocalyptic number.

It is an amenable number.

1251505 is a deficient number, since it is larger than the sum of its proper divisors (250307).

1251505 is an equidigital number, since it uses as much as digits as its factorization.

1251505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250306.

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 1251505 is about 1118.7068427430. The cubic root of 1251505 is about 107.7649494854.

The spelling of 1251505 in words is "one million, two hundred fifty-one thousand, five hundred five".