1231378941 has 8 divisors (see below), whose sum is σ = 1768133920. Its totient is φ = 757771632.

The previous prime is 1231378933. The next prime is 1231378943. The reversal of 1231378941 is 1498731321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231378941 - 2³ = 1231378933 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 31573819 = 1231378941 / (1 + 2 + 3 + 1 + 3 + 7 + 8 + 9 + 4 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231378941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231378943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15786871 + ... + 15786948.

It is an arithmetic number, because the mean of its divisors is an integer number (221016740).

Almost surely, 2^1231378941 is an apocalyptic number.

It is an amenable number.

1231378941 is a deficient number, since it is larger than the sum of its proper divisors (536754979).

1231378941 is a wasteful number, since it uses less digits than its factorization.

1231378941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31573835.

The product of its digits is 36288, while the sum is 39.

The square root of 1231378941 is about 35091.0094041195. The cubic root of 1231378941 is about 1071.8415142760.

The spelling of 1231378941 in words is "one billion, two hundred thirty-one million, three hundred seventy-eight thousand, nine hundred forty-one".