2661401 has 6 divisors (see below), whose sum is σ = 2827470. Its totient is φ = 2504576.

The previous prime is 2661397. The next prime is 2661403. The reversal of 2661401 is 1041662.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 602176 + 2059225 = 776^2 + 1435^2 .

It is not a de Polignac number, because 2661401 - 2² = 2661397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4316 + ... + 4893.

It is an arithmetic number, because the mean of its divisors is an integer number (471245).

2^2661401 is an apocalyptic number.

It is an amenable number.

2661401 is a deficient number, since it is larger than the sum of its proper divisors (166069).

2661401 is an equidigital number, since it uses as much as digits as its factorization.

2661401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9243 (or 9226 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2661401 is about 1631.3800905981. The cubic root of 2661401 is about 138.5809194923.

The spelling of 2661401 in words is "two million, six hundred sixty-one thousand, four hundred one".