73121905357 has 4 divisors (see below), whose sum is σ = 73123180956. Its totient is φ = 73120629760.

The previous prime is 73121905277. The next prime is 73121905369. The reversal of 73121905357 is 75350912137.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54844487721 + 18277417636 = 234189^2 + 135194^2 .

It is a cyclic number.

It is not a de Polignac number, because 73121905357 - 2⁷ = 73121905229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73121905397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547558 + ... + 667879.

It is an arithmetic number, because the mean of its divisors is an integer number (18280795239).

Almost surely, 2^73121905357 is an apocalyptic number.

It is an amenable number.

73121905357 is a deficient number, since it is larger than the sum of its proper divisors (1275599).

73121905357 is a wasteful number, since it uses less digits than its factorization.

73121905357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275598.

The product of its (nonzero) digits is 198450, while the sum is 43.

The spelling of 73121905357 in words is "seventy-three billion, one hundred twenty-one million, nine hundred five thousand, three hundred fifty-seven".