6466981 has 4 divisors (see below), whose sum is σ = 6482764. Its totient is φ = 6451200.

The previous prime is 6466969. The next prime is 6466991. The reversal of 6466981 is 1896646.

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 1865956 + 4601025 = 1366^2 + 2145^2 .

It is a cyclic number.

It is not a de Polignac number, because 6466981 - 2⁷ = 6466853 is a prime.

It is a super-2 number, since 2×6466981² = 83643686508722, 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 (6466921) 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, 7260 + ... + 8101.

It is an arithmetic number, because the mean of its divisors is an integer number (1620691).

Almost surely, 2^6466981 is an apocalyptic number.

It is an amenable number.

6466981 is a deficient number, since it is larger than the sum of its proper divisors (15783).

6466981 is a wasteful number, since it uses less digits than its factorization.

6466981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15782.

The product of its digits is 62208, while the sum is 40.

The square root of 6466981 is about 2543.0259534657. The cubic root of 6466981 is about 186.3090115247.

It can be divided in two parts, 6466 and 981, that added together give a palindrome (7447).

The spelling of 6466981 in words is "six million, four hundred sixty-six thousand, nine hundred eighty-one".