111661501 has 8 divisors (see below), whose sum is σ = 128275904. Its totient is φ = 95212800.

The previous prime is 111661493. The next prime is 111661507. The reversal of 111661501 is 105166111.

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

It is a cyclic number.

It is not a de Polignac number, because 111661501 - 2³ = 111661493 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 (111661507) 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 7 ways as a sum of consecutive naturals, for example, 39975 + ... + 42676.

It is an arithmetic number, because the mean of its divisors is an integer number (16034488).

Almost surely, 2^111661501 is an apocalyptic number.

It is an amenable number.

111661501 is a deficient number, since it is larger than the sum of its proper divisors (16614403).

111661501 is an equidigital number, since it uses as much as digits as its factorization.

111661501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82851.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 111661501 is about 10567.0005678054. Note that the first 3 decimals coincide. The cubic root of 111661501 is about 481.5423492472.

The spelling of 111661501 in words is "one hundred eleven million, six hundred sixty-one thousand, five hundred one".