116616821 has 4 divisors (see below), whose sum is σ = 123476652. Its totient is φ = 109756992.

The previous prime is 116616793. The next prime is 116616853. The reversal of 116616821 is 128616611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86750596 + 29866225 = 9314^2 + 5465^2 .

It is a cyclic number.

It is not a de Polignac number, because 116616821 - 2⁶ = 116616757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116616121) 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, 3429890 + ... + 3429923.

It is an arithmetic number, because the mean of its divisors is an integer number (30869163).

Almost surely, 2^116616821 is an apocalyptic number.

It is an amenable number.

116616821 is a deficient number, since it is larger than the sum of its proper divisors (6859831).

116616821 is an equidigital number, since it uses as much as digits as its factorization.

116616821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6859830.

The product of its digits is 3456, while the sum is 32.

The square root of 116616821 is about 10798.9268448305. The cubic root of 116616821 is about 488.5628038811.

The spelling of 116616821 in words is "one hundred sixteen million, six hundred sixteen thousand, eight hundred twenty-one".