61039845109 has 4 divisors (see below), whose sum is σ = 61050671500. Its totient is φ = 61029018720.

The previous prime is 61039845089. The next prime is 61039845149. The reversal of 61039845109 is 90154893016.

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 40098861009 + 20940984100 = 200247^2 + 144710^2 .

It is a cyclic number.

It is not a de Polignac number, because 61039845109 - 2⁵ = 61039845077 is a prime.

It is a super-2 number, since 2×61039845109² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61039845149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5404734 + ... + 5416015.

It is an arithmetic number, because the mean of its divisors is an integer number (15262667875).

Almost surely, 2^61039845109 is an apocalyptic number.

It is an amenable number.

61039845109 is a deficient number, since it is larger than the sum of its proper divisors (10826391).

61039845109 is a wasteful number, since it uses less digits than its factorization.

61039845109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10826390.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 61039845109 in words is "sixty-one billion, thirty-nine million, eight hundred forty-five thousand, one hundred nine".