61801217 has 2 divisors, whose sum is σ = 61801218. Its totient is φ = 61801216.

The previous prime is 61801213. The next prime is 61801231. The reversal of 61801217 is 71210816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57623281 + 4177936 = 7591^2 + 2044^2 .

It is a cyclic number.

It is not a de Polignac number, because 61801217 - 2² = 61801213 is a prime.

It is not a weakly prime, because it can be changed into another prime (61801213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30900608 + 30900609.

It is an arithmetic number, because the mean of its divisors is an integer number (30900609).

Almost surely, 2^61801217 is an apocalyptic number.

It is an amenable number.

61801217 is a deficient number, since it is larger than the sum of its proper divisors (1).

61801217 is an equidigital number, since it uses as much as digits as its factorization.

61801217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 61801217 is about 7861.3750069565. The cubic root of 61801217 is about 395.3657180104.

The spelling of 61801217 in words is "sixty-one million, eight hundred one thousand, two hundred seventeen".