172016903 has 2 divisors, whose sum is σ = 172016904. Its totient is φ = 172016902.

The previous prime is 172016869. The next prime is 172016917. The reversal of 172016903 is 309610271.

It is a strong prime.

It is an emirp because it is prime and its reverse (309610271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172016903 is a prime.

It is a super-2 number, since 2×172016903² = 59179629835422818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172016953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86008451 + 86008452.

It is an arithmetic number, because the mean of its divisors is an integer number (86008452).

Almost surely, 2^172016903 is an apocalyptic number.

172016903 is a deficient number, since it is larger than the sum of its proper divisors (1).

172016903 is an equidigital number, since it uses as much as digits as its factorization.

172016903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 172016903 is about 13115.5214536060. The cubic root of 172016903 is about 556.1479936167.

The spelling of 172016903 in words is "one hundred seventy-two million, sixteen thousand, nine hundred three".