6506381 has 4 divisors (see below), whose sum is σ = 7435872. Its totient is φ = 5576892.

The previous prime is 6506371. The next prime is 6506387. The reversal of 6506381 is 1836056.

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 not a de Polignac number, because 6506381 - 2¹⁰ = 6505357 is a prime.

It is a super-2 number, since 2×6506381² = 84665987434322, which contains 22 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 (6506387) 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, 464735 + ... + 464748.

It is an arithmetic number, because the mean of its divisors is an integer number (1858968).

Almost surely, 2^6506381 is an apocalyptic number.

It is an amenable number.

6506381 is a deficient number, since it is larger than the sum of its proper divisors (929491).

6506381 is an equidigital number, since it uses as much as digits as its factorization.

6506381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929490.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 6506381 is about 2550.7608668787. The cubic root of 6506381 is about 186.6866074927.

The spelling of 6506381 in words is "six million, five hundred six thousand, three hundred eighty-one".