61155139 has 2 divisors, whose sum is σ = 61155140. Its totient is φ = 61155138.

The previous prime is 61155109. The next prime is 61155161. The reversal of 61155139 is 93155116.

61155139 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 61155139 - 2⁷ = 61155011 is a prime.

It is a super-2 number, since 2×61155139² = 7479902052218642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61155139.

It is not a weakly prime, because it can be changed into another prime (61155109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30577569 + 30577570.

It is an arithmetic number, because the mean of its divisors is an integer number (30577570).

Almost surely, 2^61155139 is an apocalyptic number.

61155139 is a deficient number, since it is larger than the sum of its proper divisors (1).

61155139 is an equidigital number, since it uses as much as digits as its factorization.

61155139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 31.

The square root of 61155139 is about 7820.1751259163. The cubic root of 61155139 is about 393.9831539603.

The spelling of 61155139 in words is "sixty-one million, one hundred fifty-five thousand, one hundred thirty-nine".