1211125153 has 4 divisors (see below), whose sum is σ = 1384143040. Its totient is φ = 1038107268.

The previous prime is 1211125147. The next prime is 1211125159. The reversal of 1211125153 is 3515211121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3515211121 = 73 ⋅48153577.

It is an interprime number because it is at equal distance from previous prime (1211125147) and next prime (1211125159).

It is a cyclic number.

It is not a de Polignac number, because 1211125153 - 2¹³ = 1211116961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211125159) 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 in 3 ways as a sum of consecutive naturals, for example, 86508933 + ... + 86508946.

It is an arithmetic number, because the mean of its divisors is an integer number (346035760).

Almost surely, 2^1211125153 is an apocalyptic number.

It is an amenable number.

1211125153 is a deficient number, since it is larger than the sum of its proper divisors (173017887).

1211125153 is an equidigital number, since it uses as much as digits as its factorization.

1211125153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173017886.

The product of its digits is 300, while the sum is 22.

The square root of 1211125153 is about 34801.2234411378. The cubic root of 1211125153 is about 1065.9324279828.

Adding to 1211125153 its reverse (3515211121), we get a palindrome (4726336274).

The spelling of 1211125153 in words is "one billion, two hundred eleven million, one hundred twenty-five thousand, one hundred fifty-three".