6351561 has 8 divisors (see below), whose sum is σ = 9409760. Its totient is φ = 4234356.

The previous prime is 6351547. The next prime is 6351563. The reversal of 6351561 is 1651536.

It is a happy number.

It is not a de Polignac number, because 6351561 - 2²² = 2157257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 235243 = 6351561 / (6 + 3 + 5 + 1 + 5 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6351563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117595 + ... + 117648.

It is an arithmetic number, because the mean of its divisors is an integer number (1176220).

Almost surely, 2^6351561 is an apocalyptic number.

It is an amenable number.

6351561 is a deficient number, since it is larger than the sum of its proper divisors (3058199).

6351561 is a wasteful number, since it uses less digits than its factorization.

6351561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235252 (or 235246 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 6351561 is about 2520.2303466152. The cubic root of 6351561 is about 185.1939626274.

The spelling of 6351561 in words is "six million, three hundred fifty-one thousand, five hundred sixty-one".