11491556 has 6 divisors (see below), whose sum is σ = 20110230. Its totient is φ = 5745776.

The previous prime is 11491531. The next prime is 11491573. The reversal of 11491556 is 65519411.

It can be written as a sum of positive squares in only one way, i.e., 5808100 + 5683456 = 2410^2 + 2384^2 .

It is a super-2 number, since 2×11491556² = 264111718602272, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1436441 + ... + 1436448.

It is an arithmetic number, because the mean of its divisors is an integer number (3351705).

Almost surely, 2^11491556 is an apocalyptic number.

It is an amenable number.

11491556 is a deficient number, since it is larger than the sum of its proper divisors (8618674).

11491556 is a wasteful number, since it uses less digits than its factorization.

11491556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872893 (or 2872891 counting only the distinct ones).

The product of its digits is 5400, while the sum is 32.

The square root of 11491556 is about 3389.9197630622. The cubic root of 11491556 is about 225.6626129798.

It can be divided in two parts, 11 and 491556, that multiplied together give a triangular number (5407116 = T₃₂₈₈).

The spelling of 11491556 in words is "eleven million, four hundred ninety-one thousand, five hundred fifty-six".