1351421 has 2 divisors, whose sum is σ = 1351422. Its totient is φ = 1351420.

The previous prime is 1351417. The next prime is 1351423. The reversal of 1351421 is 1241531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1060900 + 290521 = 1030^2 + 539^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351421 - 2² = 1351417 is a prime.

Together with 1351423, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1351421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1351423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675710 + 675711.

It is an arithmetic number, because the mean of its divisors is an integer number (675711).

2^1351421 is an apocalyptic number.

It is an amenable number.

1351421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351421 is an equidigital number, since it uses as much as digits as its factorization.

1351421 is an evil number, because the sum of its binary digits is even.

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

The square root of 1351421 is about 1162.5063440687. The cubic root of 1351421 is about 110.5597092041.

Adding to 1351421 its reverse (1241531), we get a palindrome (2592952).

The spelling of 1351421 in words is "one million, three hundred fifty-one thousand, four hundred twenty-one".