6156561 has 4 divisors (see below), whose sum is σ = 8208752. Its totient is φ = 4104372.

The previous prime is 6156539. The next prime is 6156583. The reversal of 6156561 is 1656516.

6156561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (6156539) and next prime (6156583).

It is not a de Polignac number, because 6156561 - 2⁹ = 6156049 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

6156561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6155561) 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, 1026091 + ... + 1026096.

It is an arithmetic number, because the mean of its divisors is an integer number (2052188).

Almost surely, 2^6156561 is an apocalyptic number.

It is an amenable number.

6156561 is a deficient number, since it is larger than the sum of its proper divisors (2052191).

6156561 is a wasteful number, since it uses less digits than its factorization.

6156561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052190.

The product of its digits is 5400, while the sum is 30.

The square root of 6156561 is about 2481.2418261830. The cubic root of 6156561 is about 183.2790094328.

The spelling of 6156561 in words is "six million, one hundred fifty-six thousand, five hundred sixty-one".