61155599 has 2 divisors, whose sum is σ = 61155600. Its totient is φ = 61155598.

The previous prime is 61155593. The next prime is 61155617. The reversal of 61155599 is 99555116.

61155599 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61155599 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61155593) 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, 30577799 + 30577800.

It is an arithmetic number, because the mean of its divisors is an integer number (30577800).

Almost surely, 2^61155599 is an apocalyptic number.

61155599 is a deficient number, since it is larger than the sum of its proper divisors (1).

61155599 is an equidigital number, since it uses as much as digits as its factorization.

61155599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60750, while the sum is 41.

The square root of 61155599 is about 7820.2045369670. The cubic root of 61155599 is about 393.9841417857.

The spelling of 61155599 in words is "sixty-one million, one hundred fifty-five thousand, five hundred ninety-nine".