172373381 has 2 divisors, whose sum is σ = 172373382. Its totient is φ = 172373380.

The previous prime is 172373351. The next prime is 172373401. The reversal of 172373381 is 183373271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167288356 + 5085025 = 12934^2 + 2255^2 .

It is a cyclic number.

It is not a de Polignac number, because 172373381 - 2¹⁴ = 172356997 is a prime.

It is a super-2 number, since 2×172373381² = 59425164954742322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172373351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86186690 + 86186691.

It is an arithmetic number, because the mean of its divisors is an integer number (86186691).

Almost surely, 2^172373381 is an apocalyptic number.

It is an amenable number.

172373381 is a deficient number, since it is larger than the sum of its proper divisors (1).

172373381 is an equidigital number, since it uses as much as digits as its factorization.

172373381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 35.

The square root of 172373381 is about 13129.1043487361. The cubic root of 172373381 is about 556.5319049804.

The spelling of 172373381 in words is "one hundred seventy-two million, three hundred seventy-three thousand, three hundred eighty-one".