1131421 has 2 divisors, whose sum is σ = 1131422. Its totient is φ = 1131420.

The previous prime is 1131419. The next prime is 1131437. The reversal of 1131421 is 1241311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 980100 + 151321 = 990^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131421 - 2¹ = 1131419 is a prime.

It is a super-2 number, since 2×1131421² = 2560226958482, which contains 22 as substring.

Together with 1131419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565710 + 565711.

It is an arithmetic number, because the mean of its divisors is an integer number (565711).

2^1131421 is an apocalyptic number.

It is an amenable number.

1131421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131421 is an equidigital number, since it uses as much as digits as its factorization.

1131421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 13.

The square root of 1131421 is about 1063.6827534561. The cubic root of 1131421 is about 104.2016857903.

Adding to 1131421 its reverse (1241311), we get a palindrome (2372732).

The spelling of 1131421 in words is "one million, one hundred thirty-one thousand, four hundred twenty-one".