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BaseRepresentation
bin101010000100101011
322202101122
4222010223
521003311
63405455
71315265
oct520453
9282348
10172331
11108525
128388b
1360593
1446b35
15360db
hex2a12b

172331 has 2 divisors, whose sum is σ = 172332. Its totient is φ = 172330.

The previous prime is 172321. The next prime is 172343. The reversal of 172331 is 133271.

It is a weak prime.

It is an emirp because it is prime and its reverse (133271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-172331 is a prime.

It is a super-2 number, since 2×1723312 = 59395947122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86165 + 86166.

It is an arithmetic number, because the mean of its divisors is an integer number (86166).

2172331 is an apocalyptic number.

172331 is a deficient number, since it is larger than the sum of its proper divisors (1).

172331 is an equidigital number, since it uses as much as digits as its factorization.

172331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 17.

The square root of 172331 is about 415.1276911987. The cubic root of 172331 is about 55.6486290219.

Subtracting from 172331 its reverse (133271), we obtain a triangular number (39060 = T279).

The spelling of 172331 in words is "one hundred seventy-two thousand, three hundred thirty-one".