172773149 has 4 divisors (see below), whose sum is σ = 174092160. Its totient is φ = 171454140.

The previous prime is 172773113. The next prime is 172773151. The reversal of 172773149 is 941377271.

172773149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 941377271 = 8969 ⋅104959.

It is a cyclic number.

It is not a de Polignac number, because 172773149 - 2¹² = 172769053 is a prime.

It is a super-2 number, since 2×172773149² = 59701122030752402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172773109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 659309 + ... + 659570.

It is an arithmetic number, because the mean of its divisors is an integer number (43523040).

Almost surely, 2^172773149 is an apocalyptic number.

It is an amenable number.

172773149 is a deficient number, since it is larger than the sum of its proper divisors (1319011).

172773149 is a wasteful number, since it uses less digits than its factorization.

172773149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319010.

The product of its digits is 74088, while the sum is 41.

The square root of 172773149 is about 13144.3200280577. The cubic root of 172773149 is about 556.9618087007.

The spelling of 172773149 in words is "one hundred seventy-two million, seven hundred seventy-three thousand, one hundred forty-nine".