1231378893 has 6 divisors (see below), whose sum is σ = 1778658414. Its totient is φ = 820919256.

The previous prime is 1231378891. The next prime is 1231378921. The reversal of 1231378893 is 3988731321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1213964964 + 17413929 = 34842^2 + 4173^2 .

It is not a de Polignac number, because 1231378893 - 2¹ = 1231378891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231378891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68409930 + ... + 68409947.

It is an arithmetic number, because the mean of its divisors is an integer number (296443069).

Almost surely, 2^1231378893 is an apocalyptic number.

It is an amenable number.

1231378893 is a deficient number, since it is larger than the sum of its proper divisors (547279521).

1231378893 is a wasteful number, since it uses less digits than its factorization.

1231378893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136819883 (or 136819880 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 1231378893 is about 35091.0087201836. The cubic root of 1231378893 is about 1071.8415003490.

The spelling of 1231378893 in words is "one billion, two hundred thirty-one million, three hundred seventy-eight thousand, eight hundred ninety-three".