6406501 has 4 divisors (see below), whose sum is σ = 6783372. Its totient is φ = 6029632.

The previous prime is 6406493. The next prime is 6406507. The reversal of 6406501 is 1056046.

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 4004001 + 2402500 = 2001^2 + 1550^2 .

It is a cyclic number.

It is not a de Polignac number, because 6406501 - 2³ = 6406493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6406507) 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, 188410 + ... + 188443.

It is an arithmetic number, because the mean of its divisors is an integer number (1695843).

Almost surely, 2^6406501 is an apocalyptic number.

It is an amenable number.

6406501 is a deficient number, since it is larger than the sum of its proper divisors (376871).

6406501 is a wasteful number, since it uses less digits than its factorization.

6406501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376870.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 6406501 is about 2531.1066749547. The cubic root of 6406501 is about 185.7263965897.

The spelling of 6406501 in words is "six million, four hundred six thousand, five hundred one".