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: 181162279 = 211 ⋅858589.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 972261181.
It is a congruent number.
It is a 990-hyperperfect number.
Almost surely, 2972261181 is an apocalyptic number.
It is an amenable number.
972261181 is an equidigital number, since it uses as much as digits as its factorization.
972261181 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 982082.
The square root of 972261181 is about 31181.1029471377. The cubic root of 972261181 is about 990.6668910705. Note that the first 3 decimals are identical.
The spelling of 972261181 in words is "nine hundred seventy-two million, two hundred sixty-one thousand, one hundred eighty-one".