172981949 has 8 divisors (see below), whose sum is σ = 201900288. Its totient is φ = 145115280.

The previous prime is 172981933. The next prime is 172981961. The reversal of 172981949 is 949189271.

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 172981949 - 2⁴ = 172981933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172981897 and 172981906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172981979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262562 + ... + 263219.

It is an arithmetic number, because the mean of its divisors is an integer number (25237536).

Almost surely, 2^172981949 is an apocalyptic number.

It is an amenable number.

172981949 is a deficient number, since it is larger than the sum of its proper divisors (28918339).

172981949 is an equidigital number, since it uses as much as digits as its factorization.

172981949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525835.

The product of its digits is 326592, while the sum is 50.

The square root of 172981949 is about 13152.2602240071. The cubic root of 172981949 is about 557.1860850808.

The spelling of 172981949 in words is "one hundred seventy-two million, nine hundred eighty-one thousand, nine hundred forty-nine".