231278881 has 2 divisors, whose sum is σ = 231278882. Its totient is φ = 231278880.

The previous prime is 231278867. The next prime is 231278891. The reversal of 231278881 is 188872132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197824225 + 33454656 = 14065^2 + 5784^2 .

It is a cyclic number.

It is not a de Polignac number, because 231278881 - 2¹⁹ = 230754593 is a prime.

It is a super-2 number, since 2×231278881² = 106979841593224322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231278891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115639440 + 115639441.

It is an arithmetic number, because the mean of its divisors is an integer number (115639441).

Almost surely, 2^231278881 is an apocalyptic number.

It is an amenable number.

231278881 is a deficient number, since it is larger than the sum of its proper divisors (1).

231278881 is an equidigital number, since it uses as much as digits as its factorization.

231278881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 40.

The square root of 231278881 is about 15207.8558975288. The cubic root of 231278881 is about 613.8260647136.

The spelling of 231278881 in words is "two hundred thirty-one million, two hundred seventy-eight thousand, eight hundred eighty-one".