61801247 has 2 divisors, whose sum is σ = 61801248. Its totient is φ = 61801246.

The previous prime is 61801231. The next prime is 61801283. The reversal of 61801247 is 74210816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61801247 - 2⁴ = 61801231 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 (61801217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30900623 + 30900624.

It is an arithmetic number, because the mean of its divisors is an integer number (30900624).

Almost surely, 2^61801247 is an apocalyptic number.

61801247 is a deficient number, since it is larger than the sum of its proper divisors (1).

61801247 is an equidigital number, since it uses as much as digits as its factorization.

61801247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 61801247 is about 7861.3769150194. The cubic root of 61801247 is about 395.3657819842.

The spelling of 61801247 in words is "sixty-one million, eight hundred one thousand, two hundred forty-seven".