1127991943 has 12 divisors (see below), whose sum is σ = 1279293960. Its totient is φ = 985960512.

The previous prime is 1127991929. The next prime is 1127991971. The reversal of 1127991943 is 3491997211.

It is not a de Polignac number, because 1127991943 - 2¹³ = 1127983751 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1127991893 and 1127991902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1127991923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 526771 + ... + 528907.

It is an arithmetic number, because the mean of its divisors is an integer number (106607830).

Almost surely, 2^1127991943 is an apocalyptic number.

1127991943 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1127991943 is a deficient number, since it is larger than the sum of its proper divisors (151302017).

1127991943 is an frugal number, since it uses more digits than its factorization.

1127991943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306 (or 2169 counting only the distinct ones).

The product of its digits is 122472, while the sum is 46.

The square root of 1127991943 is about 33585.5913004372. The cubic root of 1127991943 is about 1040.9630942274.

The spelling of 1127991943 in words is "one billion, one hundred twenty-seven million, nine hundred ninety-one thousand, nine hundred forty-three".