172696973 has 2 divisors, whose sum is σ = 172696974. Its totient is φ = 172696972.

The previous prime is 172696969. The next prime is 172696981. The reversal of 172696973 is 379696271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121044004 + 51652969 = 11002^2 + 7187^2 .

It is an emirp because it is prime and its reverse (379696271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172696973 - 2² = 172696969 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172696913) 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, 86348486 + 86348487.

It is an arithmetic number, because the mean of its divisors is an integer number (86348487).

Almost surely, 2^172696973 is an apocalyptic number.

It is an amenable number.

172696973 is a deficient number, since it is larger than the sum of its proper divisors (1).

172696973 is an equidigital number, since it uses as much as digits as its factorization.

172696973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857304, while the sum is 50.

The square root of 172696973 is about 13141.4220311198. The cubic root of 172696973 is about 556.8799415049.

It can be divided in two parts, 17269 and 6973, that added together give a palindrome (24242).

The spelling of 172696973 in words is "one hundred seventy-two million, six hundred ninety-six thousand, nine hundred seventy-three".