61085639 has 2 divisors, whose sum is σ = 61085640. Its totient is φ = 61085638.

The previous prime is 61085623. The next prime is 61085657. The reversal of 61085639 is 93658016.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61085639 - 2⁴ = 61085623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61085659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30542819 + 30542820.

It is an arithmetic number, because the mean of its divisors is an integer number (30542820).

Almost surely, 2^61085639 is an apocalyptic number.

61085639 is a deficient number, since it is larger than the sum of its proper divisors (1).

61085639 is an equidigital number, since it uses as much as digits as its factorization.

61085639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 61085639 is about 7815.7302282000. The cubic root of 61085639 is about 393.8338494814.

The spelling of 61085639 in words is "sixty-one million, eighty-five thousand, six hundred thirty-nine".