172972783 has 2 divisors, whose sum is σ = 172972784. Its totient is φ = 172972782.

The previous prime is 172972781. The next prime is 172972801. The reversal of 172972783 is 387279271.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (387279271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172972783 - 2¹ = 172972781 is a prime.

Together with 172972781, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172972781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86486391 + 86486392.

It is an arithmetic number, because the mean of its divisors is an integer number (86486392).

Almost surely, 2^172972783 is an apocalyptic number.

172972783 is a deficient number, since it is larger than the sum of its proper divisors (1).

172972783 is an equidigital number, since it uses as much as digits as its factorization.

172972783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 46.

The square root of 172972783 is about 13151.9117621736. The cubic root of 172972783 is about 557.1762434800.

It can be divided in two parts, 17297278 and 3, that added together give a square (17297281 = 4159²).

The spelling of 172972783 in words is "one hundred seventy-two million, nine hundred seventy-two thousand, seven hundred eighty-three".