172961869 has 2 divisors, whose sum is σ = 172961870. Its totient is φ = 172961868.

The previous prime is 172961851. The next prime is 172961897. The reversal of 172961869 is 968169271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133749225 + 39212644 = 11565^2 + 6262^2 .

It is a cyclic number.

It is not a de Polignac number, because 172961869 - 2¹¹ = 172959821 is a prime.

It is a super-2 number, since 2×172961869² = 59831616255946322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172961809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86480934 + 86480935.

It is an arithmetic number, because the mean of its divisors is an integer number (86480935).

Almost surely, 2^172961869 is an apocalyptic number.

It is an amenable number.

172961869 is a deficient number, since it is larger than the sum of its proper divisors (1).

172961869 is an equidigital number, since it uses as much as digits as its factorization.

172961869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 172961869 is about 13151.4968349614. The cubic root of 172961869 is about 557.1645245855.

The spelling of 172961869 in words is "one hundred seventy-two million, nine hundred sixty-one thousand, eight hundred sixty-nine".