61307539 has 2 divisors, whose sum is σ = 61307540. Its totient is φ = 61307538.

The previous prime is 61307513. The next prime is 61307611. The reversal of 61307539 is 93570316.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61307539 - 2¹⁹ = 60783251 is a prime.

It is a super-2 number, since 2×61307539² = 7517228676473042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61307339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30653769 + 30653770.

It is an arithmetic number, because the mean of its divisors is an integer number (30653770).

Almost surely, 2^61307539 is an apocalyptic number.

61307539 is a deficient number, since it is larger than the sum of its proper divisors (1).

61307539 is an equidigital number, since it uses as much as digits as its factorization.

61307539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17010, while the sum is 34.

The square root of 61307539 is about 7829.9130901946. The cubic root of 61307539 is about 394.3101541459.

The spelling of 61307539 in words is "sixty-one million, three hundred seven thousand, five hundred thirty-nine".