11401661 has 4 divisors (see below), whose sum is σ = 11709852. Its totient is φ = 11093472.

The previous prime is 11401657. The next prime is 11401667. The reversal of 11401661 is 16610411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3976036 + 7425625 = 1994^2 + 2725^2 .

It is a cyclic number.

It is not a de Polignac number, because 11401661 - 2² = 11401657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11401667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154040 + ... + 154113.

It is an arithmetic number, because the mean of its divisors is an integer number (2927463).

Almost surely, 2^11401661 is an apocalyptic number.

It is an amenable number.

11401661 is a deficient number, since it is larger than the sum of its proper divisors (308191).

11401661 is an equidigital number, since it uses as much as digits as its factorization.

11401661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308190.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 11401661 is about 3376.6345671393. The cubic root of 11401661 is about 225.0726415656.

The spelling of 11401661 in words is "eleven million, four hundred one thousand, six hundred sixty-one".