115640621 has 2 divisors, whose sum is σ = 115640622. Its totient is φ = 115640620.

The previous prime is 115640617. The next prime is 115640627. The reversal of 115640621 is 126046511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67059721 + 48580900 = 8189^2 + 6970^2 .

It is a cyclic number.

It is not a de Polignac number, because 115640621 - 2² = 115640617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115640627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57820310 + 57820311.

It is an arithmetic number, because the mean of its divisors is an integer number (57820311).

Almost surely, 2^115640621 is an apocalyptic number.

It is an amenable number.

115640621 is a deficient number, since it is larger than the sum of its proper divisors (1).

115640621 is an equidigital number, since it uses as much as digits as its factorization.

115640621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 115640621 is about 10753.6329210179. The cubic root of 115640621 is about 487.1957282532.

The spelling of 115640621 in words is "one hundred fifteen million, six hundred forty thousand, six hundred twenty-one".