73909861 has 2 divisors, whose sum is σ = 73909862. Its totient is φ = 73909860.

The previous prime is 73909853. The next prime is 73909877. The reversal of 73909861 is 16890937.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52287361 + 21622500 = 7231^2 + 4650^2 .

It is a cyclic number.

It is not a de Polignac number, because 73909861 - 2³ = 73909853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73909061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36954930 + 36954931.

It is an arithmetic number, because the mean of its divisors is an integer number (36954931).

Almost surely, 2^73909861 is an apocalyptic number.

It is an amenable number.

73909861 is a deficient number, since it is larger than the sum of its proper divisors (1).

73909861 is an equidigital number, since it uses as much as digits as its factorization.

73909861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 73909861 is about 8597.0844476485. The cubic root of 73909861 is about 419.6631104215.

The spelling of 73909861 in words is "seventy-three million, nine hundred nine thousand, eight hundred sixty-one".