1131778537 has 2 divisors, whose sum is σ = 1131778538. Its totient is φ = 1131778536.

The previous prime is 1131778499. The next prime is 1131778579. The reversal of 1131778537 is 7358771311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1083002281 + 48776256 = 32909^2 + 6984^2 .

It is an emirp because it is prime and its reverse (7358771311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131778537 - 2¹⁹ = 1131254249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1131778493 and 1131778502.

It is not a weakly prime, because it can be changed into another prime (1131776537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565889268 + 565889269.

It is an arithmetic number, because the mean of its divisors is an integer number (565889269).

Almost surely, 2^1131778537 is an apocalyptic number.

It is an amenable number.

1131778537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131778537 is an equidigital number, since it uses as much as digits as its factorization.

1131778537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123480, while the sum is 43.

The square root of 1131778537 is about 33641.9163693152. The cubic root of 1131778537 is about 1042.1266078969.

The spelling of 1131778537 in words is "one billion, one hundred thirty-one million, seven hundred seventy-eight thousand, five hundred thirty-seven".