273815981 has 2 divisors, whose sum is σ = 273815982. Its totient is φ = 273815980.

The previous prime is 273815953. The next prime is 273816019. The reversal of 273815981 is 189518372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199769956 + 74046025 = 14134^2 + 8605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-273815981 is a prime.

It is a super-2 number, since 2×273815981² = 149950382901984722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (273815911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136907990 + 136907991.

It is an arithmetic number, because the mean of its divisors is an integer number (136907991).

Almost surely, 2^273815981 is an apocalyptic number.

It is an amenable number.

273815981 is a deficient number, since it is larger than the sum of its proper divisors (1).

273815981 is an equidigital number, since it uses as much as digits as its factorization.

273815981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 44.

The square root of 273815981 is about 16547.3859264840. The cubic root of 273815981 is about 649.3610929123.

The spelling of 273815981 in words is "two hundred seventy-three million, eight hundred fifteen thousand, nine hundred eighty-one".