1251105 has 8 divisors (see below), whose sum is σ = 2001792. Its totient is φ = 667248.

The previous prime is 1251101. The next prime is 1251109. The reversal of 1251105 is 5011521.

It is an interprime number because it is at equal distance from previous prime (1251101) and next prime (1251109).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1251105 - 2² = 1251101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 83407 = 1251105 / (1 + 2 + 5 + 1 + 1 + 0 + 5).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1251101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41689 + ... + 41718.

It is an arithmetic number, because the mean of its divisors is an integer number (250224).

2^1251105 is an apocalyptic number.

1251105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1251105 is a deficient number, since it is larger than the sum of its proper divisors (750687).

1251105 is an equidigital number, since it uses as much as digits as its factorization.

1251105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83415.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 1251105 is about 1118.5280506094. The cubic root of 1251105 is about 107.7534671573.

Adding to 1251105 its reverse (5011521), we get a palindrome (6262626).

The spelling of 1251105 in words is "one million, two hundred fifty-one thousand, one hundred five".