172278983 has 2 divisors, whose sum is σ = 172278984. Its totient is φ = 172278982.

The previous prime is 172278979. The next prime is 172279001. The reversal of 172278983 is 389872271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172278983 - 2² = 172278979 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172278913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86139491 + 86139492.

It is an arithmetic number, because the mean of its divisors is an integer number (86139492).

Almost surely, 2^172278983 is an apocalyptic number.

172278983 is a deficient number, since it is larger than the sum of its proper divisors (1).

172278983 is an equidigital number, since it uses as much as digits as its factorization.

172278983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 172278983 is about 13125.5088663259. The cubic root of 172278983 is about 556.4302939863.

The spelling of 172278983 in words is "one hundred seventy-two million, two hundred seventy-eight thousand, nine hundred eighty-three".