6420743331 has 4 divisors (see below), whose sum is σ = 8560991112. Its totient is φ = 4280495552.

The previous prime is 6420743323. The next prime is 6420743339. The reversal of 6420743331 is 1333470246.

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

It is an interprime number because it is at equal distance from previous prime (6420743323) and next prime (6420743339).

It is a cyclic number.

It is not a de Polignac number, because 6420743331 - 2³ = 6420743323 is a prime.

It is a super-2 number, since 2×6420743331² = 82451889845161951122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6420743292 and 6420743301.

It is not an unprimeable number, because it can be changed into a prime (6420743339) 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, 1070123886 + ... + 1070123891.

It is an arithmetic number, because the mean of its divisors is an integer number (2140247778).

Almost surely, 2^6420743331 is an apocalyptic number.

6420743331 is a deficient number, since it is larger than the sum of its proper divisors (2140247781).

6420743331 is a wasteful number, since it uses less digits than its factorization.

6420743331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140247780.

The product of its (nonzero) digits is 36288, while the sum is 33.

The square root of 6420743331 is about 80129.5409384080. The cubic root of 6420743331 is about 1858.6392455098.

The spelling of 6420743331 in words is "six billion, four hundred twenty million, seven hundred forty-three thousand, three hundred thirty-one".