661013039 has 2 divisors, whose sum is σ = 661013040. Its totient is φ = 661013038.

The previous prime is 661013009. The next prime is 661013051. The reversal of 661013039 is 930310166.

661013039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661013039 - 2¹⁶ = 660947503 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661013009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330506519 + 330506520.

It is an arithmetic number, because the mean of its divisors is an integer number (330506520).

Almost surely, 2^661013039 is an apocalyptic number.

661013039 is a deficient number, since it is larger than the sum of its proper divisors (1).

661013039 is an equidigital number, since it uses as much as digits as its factorization.

661013039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 661013039 is about 25710.1738422750. The cubic root of 661013039 is about 871.1040016449.

The spelling of 661013039 in words is "six hundred sixty-one million, thirteen thousand, thirty-nine".