268154981 has 2 divisors, whose sum is σ = 268154982. Its totient is φ = 268154980.

The previous prime is 268154977. The next prime is 268155031. The reversal of 268154981 is 189451862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193488100 + 74666881 = 13910^2 + 8641^2 .

It is a cyclic number.

It is not a de Polignac number, because 268154981 - 2² = 268154977 is a prime.

It is a super-2 number, since 2×268154981² = 143814187670220722, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268154911) 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 as a sum of consecutive naturals, namely, 134077490 + 134077491.

It is an arithmetic number, because the mean of its divisors is an integer number (134077491).

Almost surely, 2^268154981 is an apocalyptic number.

It is an amenable number.

268154981 is a deficient number, since it is larger than the sum of its proper divisors (1).

268154981 is an equidigital number, since it uses as much as digits as its factorization.

268154981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 44.

The square root of 268154981 is about 16375.4383452780. The cubic root of 268154981 is about 644.8548286148.

The spelling of 268154981 in words is "two hundred sixty-eight million, one hundred fifty-four thousand, nine hundred eighty-one".