1131311777 has 2 divisors, whose sum is σ = 1131311778. Its totient is φ = 1131311776.

The previous prime is 1131311773. The next prime is 1131311791. The reversal of 1131311777 is 7771131311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1099850896 + 31460881 = 33164^2 + 5609^2 .

It is an emirp because it is prime and its reverse (7771131311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131311777 - 2² = 1131311773 is a prime.

It is not a weakly prime, because it can be changed into another prime (1131311771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565655888 + 565655889.

It is an arithmetic number, because the mean of its divisors is an integer number (565655889).

Almost surely, 2^1131311777 is an apocalyptic number.

It is an amenable number.

1131311777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131311777 is an equidigital number, since it uses as much as digits as its factorization.

1131311777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3087, while the sum is 32.

The square root of 1131311777 is about 33634.9784747961. The cubic root of 1131311777 is about 1041.9833260668.

The spelling of 1131311777 in words is "one billion, one hundred thirty-one million, three hundred eleven thousand, seven hundred seventy-seven".