172309453 has 2 divisors, whose sum is σ = 172309454. Its totient is φ = 172309452.

The previous prime is 172309451. The next prime is 172309463. The reversal of 172309453 is 354903271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172081924 + 227529 = 13118^2 + 477^2 .

It is a cyclic number.

It is not a de Polignac number, because 172309453 - 2¹ = 172309451 is a prime.

Together with 172309451, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172309451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86154726 + 86154727.

It is an arithmetic number, because the mean of its divisors is an integer number (86154727).

Almost surely, 2^172309453 is an apocalyptic number.

172309453 is the 7017-th centered heptagonal number.

It is an amenable number.

172309453 is a deficient number, since it is larger than the sum of its proper divisors (1).

172309453 is an equidigital number, since it uses as much as digits as its factorization.

172309453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 172309453 is about 13126.6695319110. The cubic root of 172309453 is about 556.4630962688.

The spelling of 172309453 in words is "one hundred seventy-two million, three hundred nine thousand, four hundred fifty-three".