1612621 has 2 divisors, whose sum is σ = 1612622. Its totient is φ = 1612620.

The previous prime is 1612619. The next prime is 1612649. The reversal of 1612621 is 1262161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1590121 + 22500 = 1261^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1612621 - 2¹ = 1612619 is a prime.

Together with 1612619, it forms a pair of twin primes.

1612621 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1612601) 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 as a sum of consecutive naturals, namely, 806310 + 806311.

It is an arithmetic number, because the mean of its divisors is an integer number (806311).

2^1612621 is an apocalyptic number.

It is an amenable number.

1612621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1612621 is an equidigital number, since it uses as much as digits as its factorization.

1612621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 1612621 is about 1269.8901527298. The cubic root of 1612621 is about 117.2674379981.

Adding to 1612621 its reverse (1262161), we get a palindrome (2874782).

The spelling of 1612621 in words is "one million, six hundred twelve thousand, six hundred twenty-one".