61855201 has 2 divisors, whose sum is σ = 61855202. Its totient is φ = 61855200.

The previous prime is 61855193. The next prime is 61855217. The reversal of 61855201 is 10255816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40704400 + 21150801 = 6380^2 + 4599^2 .

It is a cyclic number.

It is not a de Polignac number, because 61855201 - 2³ = 61855193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61855201.

It is not a weakly prime, because it can be changed into another prime (61855291) 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, 30927600 + 30927601.

It is an arithmetic number, because the mean of its divisors is an integer number (30927601).

Almost surely, 2^61855201 is an apocalyptic number.

It is an amenable number.

61855201 is a deficient number, since it is larger than the sum of its proper divisors (1).

61855201 is an equidigital number, since it uses as much as digits as its factorization.

61855201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 61855201 is about 7864.8077535309. The cubic root of 61855201 is about 395.4808031841.

The spelling of 61855201 in words is "sixty-one million, eight hundred fifty-five thousand, two hundred one".