1251949 has 4 divisors (see below), whose sum is σ = 1255420. Its totient is φ = 1248480.

The previous prime is 1251947. The next prime is 1251953. The reversal of 1251949 is 9491521.

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 1170724 + 81225 = 1082^2 + 285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251949 - 2¹ = 1251947 is a prime.

It is a deceptive number, since it divides R_1251948.

It is a Duffinian number.

1251949 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1251949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251947) 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 3 ways as a sum of consecutive naturals, for example, 1122 + ... + 1939.

It is an arithmetic number, because the mean of its divisors is an integer number (313855).

It is a Poulet number, since it divides 2^1251948-1.

2^1251949 is an apocalyptic number.

It is an amenable number.

1251949 is a deficient number, since it is larger than the sum of its proper divisors (3471).

1251949 is an equidigital number, since it uses as much as digits as its factorization.

1251949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470.

The product of its digits is 3240, while the sum is 31.

The square root of 1251949 is about 1118.9052685549. The cubic root of 1251949 is about 107.7776920048. Note that the first 3 decimals are identical.

The spelling of 1251949 in words is "one million, two hundred fifty-one thousand, nine hundred forty-nine".