1251421 has 4 divisors (see below), whose sum is σ = 1325052. Its totient is φ = 1177792.

The previous prime is 1251409. The next prime is 1251427. The reversal of 1251421 is 1241521.

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 835396 + 416025 = 914^2 + 645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251421 - 2¹¹ = 1249373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1251395 and 1251404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251427) 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, 36790 + ... + 36823.

It is an arithmetic number, because the mean of its divisors is an integer number (331263).

2^1251421 is an apocalyptic number.

It is an amenable number.

1251421 is a deficient number, since it is larger than the sum of its proper divisors (73631).

1251421 is an equidigital number, since it uses as much as digits as its factorization.

1251421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73630.

The product of its digits is 80, while the sum is 16.

The square root of 1251421 is about 1118.6692987653. The cubic root of 1251421 is about 107.7625383995.

Adding to 1251421 its reverse (1241521), we get a palindrome (2492942).

The spelling of 1251421 in words is "one million, two hundred fifty-one thousand, four hundred twenty-one".