1125402181 has 2 divisors, whose sum is σ = 1125402182. Its totient is φ = 1125402180.

The previous prime is 1125402133. The next prime is 1125402203. The reversal of 1125402181 is 1812045211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 587626081 + 537776100 = 24241^2 + 23190^2 .

It is a cyclic number.

It is not a de Polignac number, because 1125402181 - 2¹³ = 1125393989 is a prime.

It is a super-2 number, since 2×1125402181² = 2533060137999113522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1125400181) 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, 562701090 + 562701091.

It is an arithmetic number, because the mean of its divisors is an integer number (562701091).

Almost surely, 2^1125402181 is an apocalyptic number.

It is an amenable number.

1125402181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1125402181 is an equidigital number, since it uses as much as digits as its factorization.

1125402181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 1125402181 is about 33547.0144871343. The cubic root of 1125402181 is about 1040.1658330848.

Adding to 1125402181 its reverse (1812045211), we get a palindrome (2937447392).

The spelling of 1125402181 in words is "one billion, one hundred twenty-five million, four hundred two thousand, one hundred eighty-one".