172294987 has 2 divisors, whose sum is σ = 172294988. Its totient is φ = 172294986.

The previous prime is 172294981. The next prime is 172295009. The reversal of 172294987 is 789492271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172294987 - 2³ = 172294979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172294987.

It is not a weakly prime, because it can be changed into another prime (172294981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86147493 + 86147494.

It is an arithmetic number, because the mean of its divisors is an integer number (86147494).

Almost surely, 2^172294987 is an apocalyptic number.

172294987 is a deficient number, since it is larger than the sum of its proper divisors (1).

172294987 is an equidigital number, since it uses as much as digits as its factorization.

172294987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 49.

The square root of 172294987 is about 13126.1185047218. The cubic root of 172294987 is about 556.4475234718.

The spelling of 172294987 in words is "one hundred seventy-two million, two hundred ninety-four thousand, nine hundred eighty-seven".