172839481 has 2 divisors, whose sum is σ = 172839482. Its totient is φ = 172839480.

The previous prime is 172839463. The next prime is 172839487. The reversal of 172839481 is 184938271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112699456 + 60140025 = 10616^2 + 7755^2 .

It is a cyclic number.

It is not a de Polignac number, because 172839481 - 2¹⁵ = 172806713 is a prime.

It is a super-2 number, since 2×172839481² = 59746972384698722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172839487) 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, 86419740 + 86419741.

It is an arithmetic number, because the mean of its divisors is an integer number (86419741).

Almost surely, 2^172839481 is an apocalyptic number.

It is an amenable number.

172839481 is a deficient number, since it is larger than the sum of its proper divisors (1).

172839481 is an equidigital number, since it uses as much as digits as its factorization.

172839481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 172839481 is about 13146.8430050716. The cubic root of 172839481 is about 557.0330768423.

It can be divided in two parts, 1728 and 39481, that added together give a square (41209 = 203²).

The spelling of 172839481 in words is "one hundred seventy-two million, eight hundred thirty-nine thousand, four hundred eighty-one".