61305539 has 2 divisors, whose sum is σ = 61305540. Its totient is φ = 61305538.

The previous prime is 61305509. The next prime is 61305593. The reversal of 61305539 is 93550316.

Together with next prime (61305593) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61305539 is a prime.

It is a super-2 number, since 2×61305539² = 7516738224161042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61305509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30652769 + 30652770.

It is an arithmetic number, because the mean of its divisors is an integer number (30652770).

Almost surely, 2^61305539 is an apocalyptic number.

61305539 is a deficient number, since it is larger than the sum of its proper divisors (1).

61305539 is an equidigital number, since it uses as much as digits as its factorization.

61305539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12150, while the sum is 32.

The square root of 61305539 is about 7829.7853738145. The cubic root of 61305539 is about 394.3058663161.

The spelling of 61305539 in words is "sixty-one million, three hundred five thousand, five hundred thirty-nine".