1620011 has 4 divisors (see below), whose sum is σ = 1623024. Its totient is φ = 1617000.

The previous prime is 1620001. The next prime is 1620013. The reversal of 1620011 is 1100261.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1619974 and 1620001.

It is not an unprimeable number, because it can be changed into a prime (1620013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455 + ... + 1856.

It is an arithmetic number, because the mean of its divisors is an integer number (405756).

2^1620011 is an apocalyptic number.

1620011 is a deficient number, since it is larger than the sum of its proper divisors (3013).

1620011 is an equidigital number, since it uses as much as digits as its factorization.

1620011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3012.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1620011 is about 1272.7965273366. The cubic root of 1620011 is about 117.4462950588.

Adding to 1620011 its reverse (1100261), we get a palindrome (2720272).

The spelling of 1620011 in words is "one million, six hundred twenty thousand, eleven".