1211233139 has 2 divisors, whose sum is σ = 1211233140. Its totient is φ = 1211233138.

The previous prime is 1211233123. The next prime is 1211233157. The reversal of 1211233139 is 9313321121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211233139 - 2⁴ = 1211233123 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211233039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605616569 + 605616570.

It is an arithmetic number, because the mean of its divisors is an integer number (605616570).

Almost surely, 2^1211233139 is an apocalyptic number.

1211233139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211233139 is an equidigital number, since it uses as much as digits as its factorization.

1211233139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 26.

The square root of 1211233139 is about 34802.7748750010. The cubic root of 1211233139 is about 1065.9641071636.

The spelling of 1211233139 in words is "one billion, two hundred eleven million, two hundred thirty-three thousand, one hundred thirty-nine".