6561401 has 8 divisors (see below), whose sum is σ = 8180544. Its totient is φ = 5112720.

The previous prime is 6561383. The next prime is 6561427. The reversal of 6561401 is 1041656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6561401 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6561461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42530 + ... + 42683.

It is an arithmetic number, because the mean of its divisors is an integer number (1022568).

Almost surely, 2^6561401 is an apocalyptic number.

It is an amenable number.

6561401 is a deficient number, since it is larger than the sum of its proper divisors (1619143).

6561401 is a wasteful number, since it uses less digits than its factorization.

6561401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85231.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 6561401 is about 2561.5231796726. The cubic root of 6561401 is about 187.2113579595.

The spelling of 6561401 in words is "six million, five hundred sixty-one thousand, four hundred one".