61855949 has 2 divisors, whose sum is σ = 61855950. Its totient is φ = 61855948.

The previous prime is 61855939. The next prime is 61855961. The reversal of 61855949 is 94955816.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58033924 + 3822025 = 7618^2 + 1955^2 .

It is a cyclic number.

It is not a de Polignac number, because 61855949 - 2⁸ = 61855693 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61855909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30927974 + 30927975.

It is an arithmetic number, because the mean of its divisors is an integer number (30927975).

Almost surely, 2^61855949 is an apocalyptic number.

It is an amenable number.

61855949 is a deficient number, since it is larger than the sum of its proper divisors (1).

61855949 is an equidigital number, since it uses as much as digits as its factorization.

61855949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 47.

The square root of 61855949 is about 7864.8553069971. The cubic root of 61855949 is about 395.4823973289.

The spelling of 61855949 in words is "sixty-one million, eight hundred fifty-five thousand, nine hundred forty-nine".