172671641 has 2 divisors, whose sum is σ = 172671642. Its totient is φ = 172671640.

The previous prime is 172671619. The next prime is 172671673. The reversal of 172671641 is 146176271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103449241 + 69222400 = 10171^2 + 8320^2 .

It is a cyclic number.

It is not a de Polignac number, because 172671641 - 2²⁶ = 105562777 is a prime.

It is not a weakly prime, because it can be changed into another prime (172671841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86335820 + 86335821.

It is an arithmetic number, because the mean of its divisors is an integer number (86335821).

Almost surely, 2^172671641 is an apocalyptic number.

It is an amenable number.

172671641 is a deficient number, since it is larger than the sum of its proper divisors (1).

172671641 is an equidigital number, since it uses as much as digits as its factorization.

172671641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 35.

The square root of 172671641 is about 13140.4581731384. The cubic root of 172671641 is about 556.8527115884.

The spelling of 172671641 in words is "one hundred seventy-two million, six hundred seventy-one thousand, six hundred forty-one".