172316987 has 2 divisors, whose sum is σ = 172316988. Its totient is φ = 172316986.

The previous prime is 172316983. The next prime is 172316999. The reversal of 172316987 is 789613271.

172316987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172316987 - 2² = 172316983 is a prime.

It is not a weakly prime, because it can be changed into another prime (172316983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86158493 + 86158494.

It is an arithmetic number, because the mean of its divisors is an integer number (86158494).

Almost surely, 2^172316987 is an apocalyptic number.

172316987 is a deficient number, since it is larger than the sum of its proper divisors (1).

172316987 is an equidigital number, since it uses as much as digits as its factorization.

172316987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 44.

The square root of 172316987 is about 13126.9565017943. The cubic root of 172316987 is about 556.4712063518.

The spelling of 172316987 in words is "one hundred seventy-two million, three hundred sixteen thousand, nine hundred eighty-seven".