172163977 has 2 divisors, whose sum is σ = 172163978. Its totient is φ = 172163976.

The previous prime is 172163951. The next prime is 172163983. The reversal of 172163977 is 779361271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171845881 + 318096 = 13109^2 + 564^2 .

It is a cyclic number.

It is not a de Polignac number, because 172163977 - 2¹⁵ = 172131209 is a prime.

It is not a weakly prime, because it can be changed into another prime (172163917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86081988 + 86081989.

It is an arithmetic number, because the mean of its divisors is an integer number (86081989).

Almost surely, 2^172163977 is an apocalyptic number.

It is an amenable number.

172163977 is a deficient number, since it is larger than the sum of its proper divisors (1).

172163977 is an equidigital number, since it uses as much as digits as its factorization.

172163977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 111132, while the sum is 43.

The square root of 172163977 is about 13121.1271238412. The cubic root of 172163977 is about 556.3064501563.

The spelling of 172163977 in words is "one hundred seventy-two million, one hundred sixty-three thousand, nine hundred seventy-seven".