1620081 has 24 divisors (see below), whose sum is σ = 2489760. Its totient is φ = 1052352.

The previous prime is 1620071. The next prime is 1620103. The reversal of 1620081 is 1800261.

It is not a de Polignac number, because 1620081 - 2¹¹ = 1618033 is a prime.

It is a super-2 number, since 2×1620081² = 5249324893122, which contains 22 as substring.

It is a Curzon 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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14281 + ... + 14393.

It is an arithmetic number, because the mean of its divisors is an integer number (103740).

2^1620081 is an apocalyptic number.

It is an amenable number.

1620081 is a deficient number, since it is larger than the sum of its proper divisors (869679).

1620081 is an equidigital number, since it uses as much as digits as its factorization.

1620081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1620081 is about 1272.8240255432. The cubic root of 1620081 is about 117.4479866363.

The spelling of 1620081 in words is "one million, six hundred twenty thousand, eighty-one".