1127421881 has 4 divisors (see below), whose sum is σ = 1128289764. Its totient is φ = 1126554000.

The previous prime is 1127421863. The next prime is 1127421887. The reversal of 1127421881 is 1881247211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 536154025 + 591267856 = 23155^2 + 24316^2 .

It is a cyclic number.

It is not a de Polignac number, because 1127421881 - 2⁶ = 1127421817 is a prime.

It is a super-2 number, since 2×1127421881² = 2542160195515156322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1127421887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431990 + ... + 434591.

It is an arithmetic number, because the mean of its divisors is an integer number (282072441).

Almost surely, 2^1127421881 is an apocalyptic number.

It is an amenable number.

1127421881 is a deficient number, since it is larger than the sum of its proper divisors (867883).

1127421881 is an equidigital number, since it uses as much as digits as its factorization.

1127421881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867882.

The product of its digits is 7168, while the sum is 35.

The square root of 1127421881 is about 33577.1035230855. The cubic root of 1127421881 is about 1040.7877048253.

The spelling of 1127421881 in words is "one billion, one hundred twenty-seven million, four hundred twenty-one thousand, eight hundred eighty-one".