116721641 has 4 divisors (see below), whose sum is σ = 117494784. Its totient is φ = 115948500.

The previous prime is 116721637. The next prime is 116721667. The reversal of 116721641 is 146127611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 116721641 - 2² = 116721637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (116721691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386345 + ... + 386646.

It is an arithmetic number, because the mean of its divisors is an integer number (29373696).

Almost surely, 2^116721641 is an apocalyptic number.

It is an amenable number.

116721641 is a deficient number, since it is larger than the sum of its proper divisors (773143).

116721641 is an equidigital number, since it uses as much as digits as its factorization.

116721641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773142.

The product of its digits is 2016, while the sum is 29.

The square root of 116721641 is about 10803.7790147707. The cubic root of 116721641 is about 488.7091401664.

The spelling of 116721641 in words is "one hundred sixteen million, seven hundred twenty-one thousand, six hundred forty-one".