1251045 has 20 divisors (see below), whose sum is σ = 2243340. Its totient is φ = 667008.

The previous prime is 1251043. The next prime is 1251053. The reversal of 1251045 is 5401521.

It can be written as a sum of positive squares in 2 ways, for example, as 842724 + 408321 = 918^2 + 639^2 .

It is not a de Polignac number, because 1251045 - 2¹ = 1251043 is a prime.

It is a super-2 number, since 2×1251045² = 3130227184050, which contains 22 as substring.

1251045 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251043) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 1140 + ... + 1949.

It is an arithmetic number, because the mean of its divisors is an integer number (112167).

2^1251045 is an apocalyptic number.

1251045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1251045 is a deficient number, since it is larger than the sum of its proper divisors (992295).

1251045 is an equidigital number, since it uses as much as digits as its factorization.

1251045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106 (or 3097 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 1251045 is about 1118.5012293243. The cubic root of 1251045 is about 107.7517445970.

Adding to 1251045 its reverse (5401521), we get a palindrome (6652566).

The spelling of 1251045 in words is "one million, two hundred fifty-one thousand, forty-five".