172149739 has 2 divisors, whose sum is σ = 172149740. Its totient is φ = 172149738.

The previous prime is 172149721. The next prime is 172149773. The reversal of 172149739 is 937941271.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (937941271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172149739 - 2²³ = 163761131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172149695 and 172149704.

It is not a weakly prime, because it can be changed into another prime (172149799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86074869 + 86074870.

It is an arithmetic number, because the mean of its divisors is an integer number (86074870).

Almost surely, 2^172149739 is an apocalyptic number.

172149739 is a deficient number, since it is larger than the sum of its proper divisors (1).

172149739 is an equidigital number, since it uses as much as digits as its factorization.

172149739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 172149739 is about 13120.5845525266. The cubic root of 172149739 is about 556.2911141769.

The spelling of 172149739 in words is "one hundred seventy-two million, one hundred forty-nine thousand, seven hundred thirty-nine".