172203928493 has 2 divisors, whose sum is σ = 172203928494. Its totient is φ = 172203928492.

The previous prime is 172203928459. The next prime is 172203928517. The reversal of 172203928493 is 394829302271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169166044804 + 3037883689 = 411298^2 + 55117^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172203928493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172203978493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86101964246 + 86101964247.

It is an arithmetic number, because the mean of its divisors is an integer number (86101964247).

Almost surely, 2^172203928493 is an apocalyptic number.

It is an amenable number.

172203928493 is a deficient number, since it is larger than the sum of its proper divisors (1).

172203928493 is an equidigital number, since it uses as much as digits as its factorization.

172203928493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 172203928493 in words is "one hundred seventy-two billion, two hundred three million, nine hundred twenty-eight thousand, four hundred ninety-three".