1261142033 has 2 divisors, whose sum is σ = 1261142034. Its totient is φ = 1261142032.

The previous prime is 1261141993. The next prime is 1261142039. The reversal of 1261142033 is 3302411621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1226190289 + 34951744 = 35017^2 + 5912^2 .

It is an emirp because it is prime and its reverse (3302411621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1261142033 - 2²² = 1256947729 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261142039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630571016 + 630571017.

It is an arithmetic number, because the mean of its divisors is an integer number (630571017).

Almost surely, 2^1261142033 is an apocalyptic number.

It is an amenable number.

1261142033 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261142033 is an equidigital number, since it uses as much as digits as its factorization.

1261142033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1261142033 is about 35512.5616226146. The cubic root of 1261142033 is about 1080.4085197227.

Adding to 1261142033 its reverse (3302411621), we get a palindrome (4563553654).

The spelling of 1261142033 in words is "one billion, two hundred sixty-one million, one hundred forty-two thousand, thirty-three".