27172333981 has 8 divisors (see below), whose sum is σ = 29332026584. Its totient is φ = 25022571840.

The previous prime is 27172333967. The next prime is 27172334003. The reversal of 27172333981 is 18933327172.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 382828356 + 26789505625 = 19566^2 + 163675^2 .

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 27172333981 - 2¹⁵ = 27172301213 is a prime.

It is a super-2 number, since 2×27172333981² (a number of 22 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 (27172333921) 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, 2476926 + ... + 2487871.

It is an arithmetic number, because the mean of its divisors is an integer number (3666503323).

Almost surely, 2^27172333981 is an apocalyptic number.

It is an amenable number.

27172333981 is a deficient number, since it is larger than the sum of its proper divisors (2159692603).

27172333981 is a wasteful number, since it uses less digits than its factorization.

27172333981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4965231.

The product of its digits is 381024, while the sum is 46.

The spelling of 27172333981 in words is "twenty-seven billion, one hundred seventy-two million, three hundred thirty-three thousand, nine hundred eighty-one".