6201561 has 4 divisors (see below), whose sum is σ = 8268752. Its totient is φ = 4134372.

The previous prime is 6201551. The next prime is 6201571. The reversal of 6201561 is 1651026.

It is a happy number.

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 (6201551) and next prime (6201571).

It is not a de Polignac number, because 6201561 - 2⁶ = 6201497 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6201521) 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, 1033591 + ... + 1033596.

It is an arithmetic number, because the mean of its divisors is an integer number (2067188).

Almost surely, 2^6201561 is an apocalyptic number.

It is an amenable number.

6201561 is a deficient number, since it is larger than the sum of its proper divisors (2067191).

6201561 is a wasteful number, since it uses less digits than its factorization.

6201561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067190.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 6201561 is about 2490.2933562133. The cubic root of 6201561 is about 183.7244714407.

Adding to 6201561 its reverse (1651026), we get a palindrome (7852587).

The spelling of 6201561 in words is "six million, two hundred one thousand, five hundred sixty-one".