172943959 has 2 divisors, whose sum is σ = 172943960. Its totient is φ = 172943958.

The previous prime is 172943899. The next prime is 172943971. The reversal of 172943959 is 959349271.

It is a strong prime.

It is an emirp because it is prime and its reverse (959349271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172943959 - 2²¹ = 170846807 is a prime.

It is a super-2 number, since 2×172943959² = 59819225909187362, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172940959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86471979 + 86471980.

It is an arithmetic number, because the mean of its divisors is an integer number (86471980).

Almost surely, 2^172943959 is an apocalyptic number.

172943959 is a deficient number, since it is larger than the sum of its proper divisors (1).

172943959 is an equidigital number, since it uses as much as digits as its factorization.

172943959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 49.

The square root of 172943959 is about 13150.8159062470. The cubic root of 172943959 is about 557.1452926759.

The spelling of 172943959 in words is "one hundred seventy-two million, nine hundred forty-three thousand, nine hundred fifty-nine".