61135129139 has 32 divisors (see below), whose sum is σ = 77687341056. Its totient is φ = 46873981440.

The previous prime is 61135129079. The next prime is 61135129177. The reversal of 61135129139 is 93192153116.

61135129139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 61135129139 - 2¹² = 61135125043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61135129096 and 61135129105.

It is not an unprimeable number, because it can be changed into a prime (61135128139) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 358574 + ... + 500844.

It is an arithmetic number, because the mean of its divisors is an integer number (2427729408).

Almost surely, 2^61135129139 is an apocalyptic number.

61135129139 is a deficient number, since it is larger than the sum of its proper divisors (16552211917).

61135129139 is a wasteful number, since it uses less digits than its factorization.

61135129139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142475.

The product of its digits is 43740, while the sum is 41.

The spelling of 61135129139 in words is "sixty-one billion, one hundred thirty-five million, one hundred twenty-nine thousand, one hundred thirty-nine".