111157661 has 8 divisors (see below), whose sum is σ = 116198400. Its totient is φ = 106207920.

The previous prime is 111157649. The next prime is 111157663. The reversal of 111157661 is 166751111.

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 111157661 - 2¹⁰ = 111156637 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 (111157663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20246 + ... + 25143.

It is an arithmetic number, because the mean of its divisors is an integer number (14524800).

Almost surely, 2^111157661 is an apocalyptic number.

It is an amenable number.

111157661 is a deficient number, since it is larger than the sum of its proper divisors (5040739).

111157661 is an equidigital number, since it uses as much as digits as its factorization.

111157661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45499.

The product of its digits is 1260, while the sum is 29.

The square root of 111157661 is about 10543.1333577832. The cubic root of 111157661 is about 480.8169839530.

The spelling of 111157661 in words is "one hundred eleven million, one hundred fifty-seven thousand, six hundred sixty-one".