1251413 has 4 divisors (see below), whose sum is σ = 1255020. Its totient is φ = 1247808.

The previous prime is 1251409. The next prime is 1251427. The reversal of 1251413 is 3141521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3141521 = 331 ⋅9491.

It can be written as a sum of positive squares in 2 ways, for example, as 743044 + 508369 = 862^2 + 713^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251413 - 2² = 1251409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1251391 and 1251400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251433) 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, 1220 + ... + 1997.

It is an arithmetic number, because the mean of its divisors is an integer number (313755).

2^1251413 is an apocalyptic number.

It is an amenable number.

1251413 is a deficient number, since it is larger than the sum of its proper divisors (3607).

1251413 is an equidigital number, since it uses as much as digits as its factorization.

1251413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3606.

The product of its digits is 120, while the sum is 17.

The square root of 1251413 is about 1118.6657230826. The cubic root of 1251413 is about 107.7623087666.

Adding to 1251413 its reverse (3141521), we get a palindrome (4392934).

The spelling of 1251413 in words is "one million, two hundred fifty-one thousand, four hundred thirteen".