1125561977 has 2 divisors, whose sum is σ = 1125561978. Its totient is φ = 1125561976.

The previous prime is 1125561967. The next prime is 1125561991. The reversal of 1125561977 is 7791655211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 896463481 + 229098496 = 29941^2 + 15136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1125561977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1125561967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562780988 + 562780989.

It is an arithmetic number, because the mean of its divisors is an integer number (562780989).

Almost surely, 2^1125561977 is an apocalyptic number.

It is an amenable number.

1125561977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1125561977 is an equidigital number, since it uses as much as digits as its factorization.

1125561977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132300, while the sum is 44.

The square root of 1125561977 is about 33549.3960750414. The cubic root of 1125561977 is about 1040.2150618482.

The spelling of 1125561977 in words is "one billion, one hundred twenty-five million, five hundred sixty-one thousand, nine hundred seventy-seven".