172820351 has 8 divisors (see below), whose sum is σ = 199621584. Its totient is φ = 147867520.

The previous prime is 172820327. The next prime is 172820353. The reversal of 172820351 is 153028271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172820351 - 2⁶ = 172820287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172820353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 461900 + ... + 462273.

It is an arithmetic number, because the mean of its divisors is an integer number (24952698).

Almost surely, 2^172820351 is an apocalyptic number.

172820351 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

172820351 is a deficient number, since it is larger than the sum of its proper divisors (26801233).

172820351 is a wasteful number, since it uses less digits than its factorization.

172820351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924201.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 172820351 is about 13146.1154338458. The cubic root of 172820351 is about 557.0125251415.

The spelling of 172820351 in words is "one hundred seventy-two million, eight hundred twenty thousand, three hundred fifty-one".