172471147 has 2 divisors, whose sum is σ = 172471148. Its totient is φ = 172471146.

The previous prime is 172471067. The next prime is 172471157. The reversal of 172471147 is 741174271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172471147 is a prime.

It is not a weakly prime, because it can be changed into another prime (172471157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86235573 + 86235574.

It is an arithmetic number, because the mean of its divisors is an integer number (86235574).

Almost surely, 2^172471147 is an apocalyptic number.

172471147 is a deficient number, since it is larger than the sum of its proper divisors (1).

172471147 is an equidigital number, since it uses as much as digits as its factorization.

172471147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10976, while the sum is 34.

The square root of 172471147 is about 13132.8270756909. The cubic root of 172471147 is about 556.6371022263.

The spelling of 172471147 in words is "one hundred seventy-two million, four hundred seventy-one thousand, one hundred forty-seven".