61869541 has 2 divisors, whose sum is σ = 61869542. Its totient is φ = 61869540.

The previous prime is 61869539. The next prime is 61869547. The reversal of 61869541 is 14596816.

61869541 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 can be written as a sum of positive squares in only one way, i.e., 37564641 + 24304900 = 6129^2 + 4930^2 .

It is a cyclic number.

It is not a de Polignac number, because 61869541 - 2¹ = 61869539 is a prime.

Together with 61869539, 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 = 61869494 and 61869503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61869547) 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, 30934770 + 30934771.

It is an arithmetic number, because the mean of its divisors is an integer number (30934771).

Almost surely, 2^61869541 is an apocalyptic number.

It is an amenable number.

61869541 is a deficient number, since it is larger than the sum of its proper divisors (1).

61869541 is an equidigital number, since it uses as much as digits as its factorization.

61869541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 40.

The square root of 61869541 is about 7865.7193568039. The cubic root of 61869541 is about 395.5113624926.

The spelling of 61869541 in words is "sixty-one million, eight hundred sixty-nine thousand, five hundred forty-one".