1131000557 has 2 divisors, whose sum is σ = 1131000558. Its totient is φ = 1131000556.

The previous prime is 1131000523. The next prime is 1131000583. The reversal of 1131000557 is 7550001311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1130707876 + 292681 = 33626^2 + 541^2 .

It is an emirp because it is prime and its reverse (7550001311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131000557 - 2²⁶ = 1063891693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131002557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565500278 + 565500279.

It is an arithmetic number, because the mean of its divisors is an integer number (565500279).

Almost surely, 2^1131000557 is an apocalyptic number.

It is an amenable number.

1131000557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131000557 is an equidigital number, since it uses as much as digits as its factorization.

1131000557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 525, while the sum is 23.

The square root of 1131000557 is about 33630.3517228113. The cubic root of 1131000557 is about 1041.8877686209.

Adding to 1131000557 its reverse (7550001311), we get a palindrome (8681001868).

The spelling of 1131000557 in words is "one billion, one hundred thirty-one million, five hundred fifty-seven", and thus it is an aban number.