11437561 has 8 divisors (see below), whose sum is σ = 11750984. Its totient is φ = 11128320.

The previous prime is 11437537. The next prime is 11437577. The reversal of 11437561 is 16573411.

It can be written as a sum of positive squares in 4 ways, for example, as 281961 + 11155600 = 531^2 + 3340^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11437561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11437501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4951 + ... + 6883.

It is an arithmetic number, because the mean of its divisors is an integer number (1468873).

Almost surely, 2^11437561 is an apocalyptic number.

It is an amenable number.

11437561 is a deficient number, since it is larger than the sum of its proper divisors (313423).

11437561 is an equidigital number, since it uses as much as digits as its factorization.

11437561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091.

The product of its digits is 2520, while the sum is 28.

The square root of 11437561 is about 3381.9463331047. The cubic root of 11437561 is about 225.3086201106.

It can be divided in two parts, 114 and 37561, that added together give a triangular number (37675 = T₂₇₄).

The spelling of 11437561 in words is "eleven million, four hundred thirty-seven thousand, five hundred sixty-one".