61805243 has 2 divisors, whose sum is σ = 61805244. Its totient is φ = 61805242.

The previous prime is 61805239. The next prime is 61805267. The reversal of 61805243 is 34250816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61805243 - 2² = 61805239 is a prime.

It is not a weakly prime, because it can be changed into another prime (61805213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30902621 + 30902622.

It is an arithmetic number, because the mean of its divisors is an integer number (30902622).

Almost surely, 2^61805243 is an apocalyptic number.

61805243 is a deficient number, since it is larger than the sum of its proper divisors (1).

61805243 is an equidigital number, since it uses as much as digits as its factorization.

61805243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 61805243 is about 7861.6310648618. The cubic root of 61805243 is about 395.3743031047.

The spelling of 61805243 in words is "sixty-one million, eight hundred five thousand, two hundred forty-three".