1620061 has 4 divisors (see below), whose sum is σ = 1623132. Its totient is φ = 1616992.

The previous prime is 1620041. The next prime is 1620071. The reversal of 1620061 is 1600261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 864900 + 755161 = 930^2 + 869^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620061 - 2⁹ = 1619549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620001) 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, 520 + ... + 1873.

It is an arithmetic number, because the mean of its divisors is an integer number (405783).

2^1620061 is an apocalyptic number.

It is an amenable number.

1620061 is a deficient number, since it is larger than the sum of its proper divisors (3071).

1620061 is an equidigital number, since it uses as much as digits as its factorization.

1620061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3070.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1620061 is about 1272.8161689734. The cubic root of 1620061 is about 117.4475033334.

It can be divided in two parts, 16200 and 61, that added together give a palindrome (16261).

The spelling of 1620061 in words is "one million, six hundred twenty thousand, sixty-one".