172098643 has 2 divisors, whose sum is σ = 172098644. Its totient is φ = 172098642.

The previous prime is 172098623. The next prime is 172098653. The reversal of 172098643 is 346890271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172098643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172098596 and 172098605.

It is not a weakly prime, because it can be changed into another prime (172098623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86049321 + 86049322.

It is an arithmetic number, because the mean of its divisors is an integer number (86049322).

Almost surely, 2^172098643 is an apocalyptic number.

172098643 is a deficient number, since it is larger than the sum of its proper divisors (1).

172098643 is an equidigital number, since it uses as much as digits as its factorization.

172098643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 172098643 is about 13118.6372386769. The cubic root of 172098643 is about 556.2360708880.

It can be divided in two parts, 17209 and 8643, that added together give a palindrome (25852).

The spelling of 172098643 in words is "one hundred seventy-two million, ninety-eight thousand, six hundred forty-three".