172372643 has 2 divisors, whose sum is σ = 172372644. Its totient is φ = 172372642.

The previous prime is 172372633. The next prime is 172372661. The reversal of 172372643 is 346273271.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172372643 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172372633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86186321 + 86186322.

It is an arithmetic number, because the mean of its divisors is an integer number (86186322).

Almost surely, 2^172372643 is an apocalyptic number.

172372643 is a deficient number, since it is larger than the sum of its proper divisors (1).

172372643 is an equidigital number, since it uses as much as digits as its factorization.

172372643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 35.

The square root of 172372643 is about 13129.0762432092. The cubic root of 172372643 is about 556.5311107334.

The spelling of 172372643 in words is "one hundred seventy-two million, three hundred seventy-two thousand, six hundred forty-three".