1131012121 has 4 divisors (see below), whose sum is σ = 1131370192. Its totient is φ = 1130654052.

The previous prime is 1131012067. The next prime is 1131012137. The reversal of 1131012121 is 1212101311.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1131012121 - 2¹⁷ = 1130881049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131012191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174255 + ... + 180628.

It is an arithmetic number, because the mean of its divisors is an integer number (282842548).

Almost surely, 2^1131012121 is an apocalyptic number.

It is an amenable number.

1131012121 is a deficient number, since it is larger than the sum of its proper divisors (358071).

1131012121 is an equidigital number, since it uses as much as digits as its factorization.

1131012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358070.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1131012121 is about 33630.5236503983. The cubic root of 1131012121 is about 1041.8913195620.

Adding to 1131012121 its reverse (1212101311), we get a palindrome (2343113432).

The spelling of 1131012121 in words is "one billion, one hundred thirty-one million, twelve thousand, one hundred twenty-one".