6251661 has 24 divisors (see below), whose sum is σ = 10090080. Its totient is φ = 3845232.

The previous prime is 6251659. The next prime is 6251669. The reversal of 6251661 is 1661526.

It is a happy number.

It is not a de Polignac number, because 6251661 - 2¹ = 6251659 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6251669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2170 + ... + 4148.

It is an arithmetic number, because the mean of its divisors is an integer number (420420).

Almost surely, 2^6251661 is an apocalyptic number.

It is an amenable number.

6251661 is a deficient number, since it is larger than the sum of its proper divisors (3838419).

6251661 is a wasteful number, since it uses less digits than its factorization.

6251661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007 (or 1995 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 6251661 is about 2500.3321779316. The cubic root of 6251661 is about 184.2178912902.

The spelling of 6251661 in words is "six million, two hundred fifty-one thousand, six hundred sixty-one".