1131220787 has 2 divisors, whose sum is σ = 1131220788. Its totient is φ = 1131220786.

The previous prime is 1131220771. The next prime is 1131220813. The reversal of 1131220787 is 7870221311.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1131220787 - 2⁴ = 1131220771 is a prime.

It is not a weakly prime, because it can be changed into another prime (1131220087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565610393 + 565610394.

It is an arithmetic number, because the mean of its divisors is an integer number (565610394).

Almost surely, 2^1131220787 is an apocalyptic number.

1131220787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131220787 is an equidigital number, since it uses as much as digits as its factorization.

1131220787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 1131220787 is about 33633.6258378427. The cubic root of 1131220787 is about 1041.9553901766.

The spelling of 1131220787 in words is "one billion, one hundred thirty-one million, two hundred twenty thousand, seven hundred eighty-seven".