61138165 has 16 divisors (see below), whose sum is σ = 81351936. Its totient is φ = 43732800.

The previous prime is 61138153. The next prime is 61138183. The reversal of 61138165 is 56183116.

It is not a de Polignac number, because 61138165 - 2²⁵ = 27583733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5757 + ... + 12466.

It is an arithmetic number, because the mean of its divisors is an integer number (5084496).

Almost surely, 2^61138165 is an apocalyptic number.

It is an amenable number.

61138165 is a deficient number, since it is larger than the sum of its proper divisors (20213771).

61138165 is a wasteful number, since it uses less digits than its factorization.

61138165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18300.

The product of its digits is 4320, while the sum is 31.

The square root of 61138165 is about 7819.0897807865. The cubic root of 61138165 is about 393.9466997393.

The spelling of 61138165 in words is "sixty-one million, one hundred thirty-eight thousand, one hundred sixty-five".