73291861 has 2 divisors, whose sum is σ = 73291862. Its totient is φ = 73291860.

The previous prime is 73291859. The next prime is 73291871. The reversal of 73291861 is 16819237.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43151761 + 30140100 = 6569^2 + 5490^2 .

It is a cyclic number.

It is not a de Polignac number, because 73291861 - 2¹ = 73291859 is a prime.

Together with 73291859, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 73291861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73291871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36645930 + 36645931.

It is an arithmetic number, because the mean of its divisors is an integer number (36645931).

Almost surely, 2^73291861 is an apocalyptic number.

It is an amenable number.

73291861 is a deficient number, since it is larger than the sum of its proper divisors (1).

73291861 is an equidigital number, since it uses as much as digits as its factorization.

73291861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 73291861 is about 8561.0665807480. The cubic root of 73291861 is about 418.4901589582.

The spelling of 73291861 in words is "seventy-three million, two hundred ninety-one thousand, eight hundred sixty-one".