308142881 has 2 divisors, whose sum is σ = 308142882. Its totient is φ = 308142880.

The previous prime is 308142871. The next prime is 308142941. The reversal of 308142881 is 188241803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208542481 + 99600400 = 14441^2 + 9980^2 .

It is a cyclic number.

It is not a de Polignac number, because 308142881 - 2¹⁰ = 308141857 is a prime.

It is a super-2 number, since 2×308142881² = 189904070221960322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (308142851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154071440 + 154071441.

It is an arithmetic number, because the mean of its divisors is an integer number (154071441).

Almost surely, 2^308142881 is an apocalyptic number.

It is an amenable number.

308142881 is a deficient number, since it is larger than the sum of its proper divisors (1).

308142881 is an equidigital number, since it uses as much as digits as its factorization.

308142881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 308142881 is about 17553.9990030762. Note that the first 3 decimals coincide. The cubic root of 308142881 is about 675.4357541157.

Adding to 308142881 its sum of digits (35), we get a square (308142916 = 17554²).

The spelling of 308142881 in words is "three hundred eight million, one hundred forty-two thousand, eight hundred eighty-one".