1620611 has 2 divisors, whose sum is σ = 1620612. Its totient is φ = 1620610.

The previous prime is 1620589. The next prime is 1620613. The reversal of 1620611 is 1160261.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1620611 - 2⁶ = 1620547 is a prime.

Together with 1620613, 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 1620611.

It is not a weakly prime, because it can be changed into another prime (1620613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810305 + 810306.

It is an arithmetic number, because the mean of its divisors is an integer number (810306).

2^1620611 is an apocalyptic number.

1620611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620611 is an equidigital number, since it uses as much as digits as its factorization.

1620611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1620611 is about 1273.0322069767. The cubic root of 1620611 is about 117.4607927133.

Adding to 1620611 its reverse (1160261), we get a palindrome (2780872).

The spelling of 1620611 in words is "one million, six hundred twenty thousand, six hundred eleven".