239891481 has 6 divisors (see below), whose sum is σ = 346509930. Its totient is φ = 159927648.

The previous prime is 239891419. The next prime is 239891489. The reversal of 239891481 is 184198932.

It can be written as a sum of positive squares in only one way, i.e., 134931456 + 104960025 = 11616^2 + 10245^2 .

It is not a de Polignac number, because 239891481 - 2¹⁰ = 239890457 is a prime.

It is a super-2 number, since 2×239891481² = 115095845312746722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (239891489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13327296 + ... + 13327313.

It is an arithmetic number, because the mean of its divisors is an integer number (57751655).

Almost surely, 2^239891481 is an apocalyptic number.

It is an amenable number.

239891481 is a deficient number, since it is larger than the sum of its proper divisors (106618449).

239891481 is a wasteful number, since it uses less digits than its factorization.

239891481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26654615 (or 26654612 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 239891481 is about 15488.4305531581. The cubic root of 239891481 is about 621.3528221354.

The spelling of 239891481 in words is "two hundred thirty-nine million, eight hundred ninety-one thousand, four hundred eighty-one".