1131228139 has 2 divisors, whose sum is σ = 1131228140. Its totient is φ = 1131228138.

The previous prime is 1131228083. The next prime is 1131228149. The reversal of 1131228139 is 9318221311.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1131228139 - 2⁹ = 1131227627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1131228139.

It is not a weakly prime, because it can be changed into another prime (1131228149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565614069 + 565614070.

It is an arithmetic number, because the mean of its divisors is an integer number (565614070).

Almost surely, 2^1131228139 is an apocalyptic number.

1131228139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131228139 is an equidigital number, since it uses as much as digits as its factorization.

1131228139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 31.

The square root of 1131228139 is about 33633.7351330476. The cubic root of 1131228139 is about 1041.9576474546.

The spelling of 1131228139 in words is "one billion, one hundred thirty-one million, two hundred twenty-eight thousand, one hundred thirty-nine".