172140523 has 2 divisors, whose sum is σ = 172140524. Its totient is φ = 172140522.

The previous prime is 172140503. The next prime is 172140547. The reversal of 172140523 is 325041271.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172140523 is a prime.

It is not a weakly prime, because it can be changed into another prime (172140503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86070261 + 86070262.

It is an arithmetic number, because the mean of its divisors is an integer number (86070262).

Almost surely, 2^172140523 is an apocalyptic number.

172140523 is a deficient number, since it is larger than the sum of its proper divisors (1).

172140523 is an equidigital number, since it uses as much as digits as its factorization.

172140523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 172140523 is about 13120.2333439615. The cubic root of 172140523 is about 556.2811870239.

Adding to 172140523 its reverse (325041271), we get a palindrome (497181794).

The spelling of 172140523 in words is "one hundred seventy-two million, one hundred forty thousand, five hundred twenty-three".