1620101 has 4 divisors (see below), whose sum is σ = 1851552. Its totient is φ = 1388652.

The previous prime is 1620071. The next prime is 1620103. The reversal of 1620101 is 1010261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1010261 = 7 ⋅144323.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620101 is a prime.

It is a super-3 number, since 3×1620101³ = 12756969728333670903, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620103) 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, 115715 + ... + 115728.

It is an arithmetic number, because the mean of its divisors is an integer number (462888).

2^1620101 is an apocalyptic number.

It is an amenable number.

1620101 is a deficient number, since it is larger than the sum of its proper divisors (231451).

1620101 is an equidigital number, since it uses as much as digits as its factorization.

1620101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231450.

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

The square root of 1620101 is about 1272.8318820646. The cubic root of 1620101 is about 117.4484699352.

Adding to 1620101 its reverse (1010261), we get a palindrome (2630362).

The spelling of 1620101 in words is "one million, six hundred twenty thousand, one hundred one".