6420161 has 4 divisors (see below), whose sum is σ = 7003824. Its totient is φ = 5836500.

The previous prime is 6420109. The next prime is 6420173. The reversal of 6420161 is 1610246.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6420161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6420061) 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, 291815 + ... + 291836.

It is an arithmetic number, because the mean of its divisors is an integer number (1750956).

Almost surely, 2^6420161 is an apocalyptic number.

It is an amenable number.

6420161 is a deficient number, since it is larger than the sum of its proper divisors (583663).

6420161 is a wasteful number, since it uses less digits than its factorization.

6420161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583662.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 6420161 is about 2533.8036624806. The cubic root of 6420161 is about 185.8583053886.

The spelling of 6420161 in words is "six million, four hundred twenty thousand, one hundred sixty-one".