1361621 has 4 divisors (see below), whose sum is σ = 1364832. Its totient is φ = 1358412.

The previous prime is 1361609. The next prime is 1361629. The reversal of 1361621 is 1261631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1261631 = 7 ⋅180233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1361621 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 = 1361593 and 1361602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851 + ... + 1856.

It is an arithmetic number, because the mean of its divisors is an integer number (341208).

2^1361621 is an apocalyptic number.

It is an amenable number.

1361621 is a deficient number, since it is larger than the sum of its proper divisors (3211).

1361621 is an equidigital number, since it uses as much as digits as its factorization.

1361621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210.

The product of its digits is 216, while the sum is 20.

The square root of 1361621 is about 1166.8851700146. The cubic root of 1361621 is about 110.8371662169.

The spelling of 1361621 in words is "one million, three hundred sixty-one thousand, six hundred twenty-one".