6420901369 has 4 divisors (see below), whose sum is σ = 6508858996. Its totient is φ = 6332943744.

The previous prime is 6420901271. The next prime is 6420901429. The reversal of 6420901369 is 9631090246.

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 2882079225 + 3538822144 = 53685^2 + 59488^2 .

It is a cyclic number.

It is not a de Polignac number, because 6420901369 - 2¹¹ = 6420899321 is a prime.

It is a super-2 number, since 2×6420901369² = 82455948780852148322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6420901769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43978704 + ... + 43978849.

It is an arithmetic number, because the mean of its divisors is an integer number (1627214749).

Almost surely, 2^6420901369 is an apocalyptic number.

It is an amenable number.

6420901369 is a deficient number, since it is larger than the sum of its proper divisors (87957627).

6420901369 is an equidigital number, since it uses as much as digits as its factorization.

6420901369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87957626.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 6420901369 is about 80130.5270730201. The cubic root of 6420901369 is about 1858.6544946902.

The spelling of 6420901369 in words is "six billion, four hundred twenty million, nine hundred one thousand, three hundred sixty-nine".