111661487 has 16 divisors (see below), whose sum is σ = 130176000. Its totient is φ = 93804480.

The previous prime is 111661471. The next prime is 111661493. The reversal of 111661487 is 784166111.

It is not a de Polignac number, because 111661487 - 2⁴ = 111661471 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 (111661787) 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 15 ways as a sum of consecutive naturals, for example, 98339 + ... + 99467.

It is an arithmetic number, because the mean of its divisors is an integer number (8136000).

Almost surely, 2^111661487 is an apocalyptic number.

111661487 is a deficient number, since it is larger than the sum of its proper divisors (18514513).

111661487 is a wasteful number, since it uses less digits than its factorization.

111661487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406.

The product of its digits is 8064, while the sum is 35.

The square root of 111661487 is about 10566.9999053658. Note that the first 4 decimals coincide. The cubic root of 111661487 is about 481.5423291221.

The spelling of 111661487 in words is "one hundred eleven million, six hundred sixty-one thousand, four hundred eighty-seven".