1620013 has 2 divisors, whose sum is σ = 1620014. Its totient is φ = 1620012.

The previous prime is 1620001. The next prime is 1620019. The reversal of 1620013 is 3100261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1075369 + 544644 = 1037^2 + 738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1619975 and 1620002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810006 + 810007.

It is an arithmetic number, because the mean of its divisors is an integer number (810007).

2^1620013 is an apocalyptic number.

It is an amenable number.

1620013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620013 is an equidigital number, since it uses as much as digits as its factorization.

1620013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1620013 is about 1272.7973130078. The cubic root of 1620013 is about 117.4463433903.

Adding to 1620013 its reverse (3100261), we get a palindrome (4720274).

The spelling of 1620013 in words is "one million, six hundred twenty thousand, thirteen".