116221561 has 8 divisors (see below), whose sum is σ = 120433280. Its totient is φ = 112078512.

The previous prime is 116221559. The next prime is 116221597. The reversal of 116221561 is 165122611.

It is a happy number.

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 116221561 - 2¹ = 116221559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (116221661) 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, 13710 + ... + 20503.

It is an arithmetic number, because the mean of its divisors is an integer number (15054160).

Almost surely, 2^116221561 is an apocalyptic number.

It is an amenable number.

116221561 is a deficient number, since it is larger than the sum of its proper divisors (4211719).

116221561 is an equidigital number, since it uses as much as digits as its factorization.

116221561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34335.

The product of its digits is 720, while the sum is 25.

The square root of 116221561 is about 10780.6104187101. The cubic root of 116221561 is about 488.0102022972.

The spelling of 116221561 in words is "one hundred sixteen million, two hundred twenty-one thousand, five hundred sixty-one".