61843973 has 2 divisors, whose sum is σ = 61843974. Its totient is φ = 61843972.

The previous prime is 61843939. The next prime is 61843997. The reversal of 61843973 is 37934816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59706529 + 2137444 = 7727^2 + 1462^2 .

It is a cyclic number.

It is not a de Polignac number, because 61843973 - 2¹⁸ = 61581829 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61843973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61843673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30921986 + 30921987.

It is an arithmetic number, because the mean of its divisors is an integer number (30921987).

Almost surely, 2^61843973 is an apocalyptic number.

It is an amenable number.

61843973 is a deficient number, since it is larger than the sum of its proper divisors (1).

61843973 is an equidigital number, since it uses as much as digits as its factorization.

61843973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The square root of 61843973 is about 7864.0939083915. The cubic root of 61843973 is about 395.4568724173.

The spelling of 61843973 in words is "sixty-one million, eight hundred forty-three thousand, nine hundred seventy-three".