273195121981 has 8 divisors (see below), whose sum is σ = 290340764280. Its totient is φ = 256168962048.

The previous prime is 273195121967. The next prime is 273195121987. The reversal of 273195121981 is 189121591372.

It can be written as a sum of positive squares in 4 ways, for example, as 1033622500 + 272161499481 = 32150^2 + 521691^2 .

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 273195121981 - 2⁷ = 273195121853 is a prime.

It is a super-2 number, since 2×273195121981² (a number of 24 digits) 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 (273195121987) 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, 29865876 + ... + 29875021.

It is an arithmetic number, because the mean of its divisors is an integer number (36292595535).

Almost surely, 2^273195121981 is an apocalyptic number.

It is an amenable number.

273195121981 is a deficient number, since it is larger than the sum of its proper divisors (17145642299).

273195121981 is a wasteful number, since it uses less digits than its factorization.

273195121981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59741183.

The product of its digits is 272160, while the sum is 49.

The spelling of 273195121981 in words is "two hundred seventy-three billion, one hundred ninety-five million, one hundred twenty-one thousand, nine hundred eighty-one".