172111403 has 2 divisors, whose sum is σ = 172111404. Its totient is φ = 172111402.

The previous prime is 172111363. The next prime is 172111427. The reversal of 172111403 is 304111271.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172111403 - 2⁶ = 172111339 is a prime.

It is not a weakly prime, because it can be changed into another prime (172111463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86055701 + 86055702.

It is an arithmetic number, because the mean of its divisors is an integer number (86055702).

Almost surely, 2^172111403 is an apocalyptic number.

172111403 is a deficient number, since it is larger than the sum of its proper divisors (1).

172111403 is an equidigital number, since it uses as much as digits as its factorization.

172111403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 172111403 is about 13119.1235606652. The cubic root of 172111403 is about 556.2498176492.

Adding to 172111403 its reverse (304111271), we get a palindrome (476222674).

The spelling of 172111403 in words is "one hundred seventy-two million, one hundred eleven thousand, four hundred three".