1243378131 has 8 divisors (see below), whose sum is σ = 1658675664. Its totient is φ = 828499680.

The previous prime is 1243378127. The next prime is 1243378187. The reversal of 1243378131 is 1318733421.

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

It is not a de Polignac number, because 1243378131 - 2² = 1243378127 is a prime.

It is a super-2 number, since 2×1243378131² = 3091978353298106322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1243378092 and 1243378101.

It is not an unprimeable number, because it can be changed into a prime (1243378531) 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, 97780 + ... + 109761.

It is an arithmetic number, because the mean of its divisors is an integer number (207334458).

Almost surely, 2^1243378131 is an apocalyptic number.

1243378131 is a deficient number, since it is larger than the sum of its proper divisors (415297533).

1243378131 is a wasteful number, since it uses less digits than its factorization.

1243378131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209541.

The product of its digits is 12096, while the sum is 33.

The square root of 1243378131 is about 35261.5673361239. The cubic root of 1243378131 is about 1075.3117915860.

The spelling of 1243378131 in words is "one billion, two hundred forty-three million, three hundred seventy-eight thousand, one hundred thirty-one".