1127136561 has 4 divisors (see below), whose sum is σ = 1502848752. Its totient is φ = 751424372.

The previous prime is 1127136559. The next prime is 1127136581. The reversal of 1127136561 is 1656317211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1656317211 = 3 ⋅552105737.

It is a cyclic number.

It is not a de Polignac number, because 1127136561 - 2¹ = 1127136559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1127136581) 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, 187856091 + ... + 187856096.

It is an arithmetic number, because the mean of its divisors is an integer number (375712188).

Almost surely, 2^1127136561 is an apocalyptic number.

It is an amenable number.

1127136561 is a deficient number, since it is larger than the sum of its proper divisors (375712191).

1127136561 is an equidigital number, since it uses as much as digits as its factorization.

1127136561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375712190.

The product of its digits is 7560, while the sum is 33.

The square root of 1127136561 is about 33572.8545256432. The cubic root of 1127136561 is about 1040.6998990071.

The spelling of 1127136561 in words is "one billion, one hundred twenty-seven million, one hundred thirty-six thousand, five hundred sixty-one".