172981247 has 2 divisors, whose sum is σ = 172981248. Its totient is φ = 172981246.

The previous prime is 172981243. The next prime is 172981279. The reversal of 172981247 is 742189271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172981247 - 2² = 172981243 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172981243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86490623 + 86490624.

It is an arithmetic number, because the mean of its divisors is an integer number (86490624).

Almost surely, 2^172981247 is an apocalyptic number.

172981247 is a deficient number, since it is larger than the sum of its proper divisors (1).

172981247 is an equidigital number, since it uses as much as digits as its factorization.

172981247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 41.

The square root of 172981247 is about 13152.2335365519. The cubic root of 172981247 is about 557.1853313506.

The spelling of 172981247 in words is "one hundred seventy-two million, nine hundred eighty-one thousand, two hundred forty-seven".