6561151 has 2 divisors, whose sum is σ = 6561152. Its totient is φ = 6561150.

The previous prime is 6561143. The next prime is 6561161. The reversal of 6561151 is 1511656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6561151 - 2³ = 6561143 is a prime.

6561151 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6561161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280575 + 3280576.

It is an arithmetic number, because the mean of its divisors is an integer number (3280576).

Almost surely, 2^6561151 is an apocalyptic number.

6561151 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561151 is an equidigital number, since it uses as much as digits as its factorization.

6561151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 25.

The square root of 6561151 is about 2561.4743801178. The cubic root of 6561151 is about 187.2089802441.

It can be divided in two parts, 65 and 61151, that added together give a palindrome (61216).

The spelling of 6561151 in words is "six million, five hundred sixty-one thousand, one hundred fifty-one".