1231781948 has 24 divisors (see below), whose sum is σ = 2216684400. Its totient is φ = 598485888.

The previous prime is 1231781927. The next prime is 1231781953. The reversal of 1231781948 is 8491871321.

It is a junction number, because it is equal to n+sod(n) for n = 1231781899 and 1231781908.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 122288 + ... + 131976.

It is an arithmetic number, because the mean of its divisors is an integer number (92361850).

Almost surely, 2^1231781948 is an apocalyptic number.

It is an amenable number.

1231781948 is a deficient number, since it is larger than the sum of its proper divisors (984902452).

1231781948 is a wasteful number, since it uses less digits than its factorization.

1231781948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10589 (or 10587 counting only the distinct ones).

The product of its digits is 96768, while the sum is 44.

The square root of 1231781948 is about 35096.7512456638. The cubic root of 1231781948 is about 1071.9584326627.

The spelling of 1231781948 in words is "one billion, two hundred thirty-one million, seven hundred eighty-one thousand, nine hundred forty-eight".