61864541 has 2 divisors, whose sum is σ = 61864542. Its totient is φ = 61864540.

The previous prime is 61864519. The next prime is 61864559. The reversal of 61864541 is 14546816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32205625 + 29658916 = 5675^2 + 5446^2 .

It is a cyclic number.

It is not a de Polignac number, because 61864541 - 2¹⁸ = 61602397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61864571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30932270 + 30932271.

It is an arithmetic number, because the mean of its divisors is an integer number (30932271).

Almost surely, 2^61864541 is an apocalyptic number.

It is an amenable number.

61864541 is a deficient number, since it is larger than the sum of its proper divisors (1).

61864541 is an equidigital number, since it uses as much as digits as its factorization.

61864541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 35.

The square root of 61864541 is about 7865.4015154981. The cubic root of 61864541 is about 395.5007077609.

The spelling of 61864541 in words is "sixty-one million, eight hundred sixty-four thousand, five hundred forty-one".