172649899 has 2 divisors, whose sum is σ = 172649900. Its totient is φ = 172649898.

The previous prime is 172649863. The next prime is 172649923. The reversal of 172649899 is 998946271.

It is a strong prime.

It is an emirp because it is prime and its reverse (998946271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172649899 - 2⁹ = 172649387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172649809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86324949 + 86324950.

It is an arithmetic number, because the mean of its divisors is an integer number (86324950).

Almost surely, 2^172649899 is an apocalyptic number.

172649899 is a deficient number, since it is larger than the sum of its proper divisors (1).

172649899 is an equidigital number, since it uses as much as digits as its factorization.

172649899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 55.

The square root of 172649899 is about 13139.6308547843. The cubic root of 172649899 is about 556.8293385168.

The spelling of 172649899 in words is "one hundred seventy-two million, six hundred forty-nine thousand, eight hundred ninety-nine".