1351621 has 2 divisors, whose sum is σ = 1351622. Its totient is φ = 1351620.

The previous prime is 1351589. The next prime is 1351639. The reversal of 1351621 is 1261531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1179396 + 172225 = 1086^2 + 415^2 .

It is an emirp because it is prime and its reverse (1261531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1351621 - 2⁵ = 1351589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1351121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675810 + 675811.

It is an arithmetic number, because the mean of its divisors is an integer number (675811).

2^1351621 is an apocalyptic number.

It is an amenable number.

1351621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351621 is an equidigital number, since it uses as much as digits as its factorization.

1351621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 19.

The square root of 1351621 is about 1162.5923619223. The cubic root of 1351621 is about 110.5651629329.

The spelling of 1351621 in words is "one million, three hundred fifty-one thousand, six hundred twenty-one".