61155539 has 2 divisors, whose sum is σ = 61155540. Its totient is φ = 61155538.

The previous prime is 61155533. The next prime is 61155541. The reversal of 61155539 is 93555116.

It is a happy number.

61155539 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 a de Polignac number, because none of the positive numbers 2^k-61155539 is a prime.

Together with 61155541, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_3626657 and since 61155539 and 3626657 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 61155499 and 61155508.

It is not a weakly prime, because it can be changed into another prime (61155533) 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, 30577769 + 30577770.

It is an arithmetic number, because the mean of its divisors is an integer number (30577770).

Almost surely, 2^61155539 is an apocalyptic number.

61155539 is a deficient number, since it is larger than the sum of its proper divisors (1).

61155539 is an equidigital number, since it uses as much as digits as its factorization.

61155539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20250, while the sum is 35.

The square root of 61155539 is about 7820.2007007493. The cubic root of 61155539 is about 393.9840129392.

The spelling of 61155539 in words is "sixty-one million, one hundred fifty-five thousand, five hundred thirty-nine".