61869539 has 2 divisors, whose sum is σ = 61869540. Its totient is φ = 61869538.

The previous prime is 61869523. The next prime is 61869541. The reversal of 61869539 is 93596816.

61869539 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 61869539 - 2⁴ = 61869523 is a prime.

Together with 61869541, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61869493 and 61869502.

It is not a weakly prime, because it can be changed into another prime (61869569) 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, 30934769 + 30934770.

It is an arithmetic number, because the mean of its divisors is an integer number (30934770).

Almost surely, 2^61869539 is an apocalyptic number.

61869539 is a deficient number, since it is larger than the sum of its proper divisors (1).

61869539 is an equidigital number, since it uses as much as digits as its factorization.

61869539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 47.

The square root of 61869539 is about 7865.7192296700. The cubic root of 61869539 is about 395.5113582309.

The spelling of 61869539 in words is "sixty-one million, eight hundred sixty-nine thousand, five hundred thirty-nine".