1131978207 has 4 divisors (see below), whose sum is σ = 1509304280. Its totient is φ = 754652136.

The previous prime is 1131978193. The next prime is 1131978217. The reversal of 1131978207 is 7028791311.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1131978207 - 2⁷ = 1131978079 is a prime.

It is a super-2 number, since 2×1131978207² = 2562749322245869698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131978217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188663032 + ... + 188663037.

It is an arithmetic number, because the mean of its divisors is an integer number (377326070).

Almost surely, 2^1131978207 is an apocalyptic number.

1131978207 is a deficient number, since it is larger than the sum of its proper divisors (377326073).

1131978207 is an equidigital number, since it uses as much as digits as its factorization.

1131978207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377326072.

The product of its (nonzero) digits is 21168, while the sum is 39.

The square root of 1131978207 is about 33644.8838161168. The cubic root of 1131978207 is about 1042.1878887857.

The spelling of 1131978207 in words is "one billion, one hundred thirty-one million, nine hundred seventy-eight thousand, two hundred seven".