116621009 has 2 divisors, whose sum is σ = 116621010. Its totient is φ = 116621008.

The previous prime is 116620997. The next prime is 116621027. The reversal of 116621009 is 900126611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113209600 + 3411409 = 10640^2 + 1847^2 .

It is a cyclic number.

It is not a de Polignac number, because 116621009 - 2⁸ = 116620753 is a prime.

It is not a weakly prime, because it can be changed into another prime (116621809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58310504 + 58310505.

It is an arithmetic number, because the mean of its divisors is an integer number (58310505).

Almost surely, 2^116621009 is an apocalyptic number.

It is an amenable number.

116621009 is a deficient number, since it is larger than the sum of its proper divisors (1).

116621009 is an equidigital number, since it uses as much as digits as its factorization.

116621009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 116621009 is about 10799.1207512464. The cubic root of 116621009 is about 488.5686523127.

The spelling of 116621009 in words is "one hundred sixteen million, six hundred twenty-one thousand, nine".