1212111031 has 4 divisors (see below), whose sum is σ = 1212228072. Its totient is φ = 1211993992.

The previous prime is 1212110989. The next prime is 1212111037. The reversal of 1212111031 is 1301112121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212111031 - 2⁷ = 1212110903 is a prime.

It is a super-2 number, since 2×1212111031² = 2938426302943765922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212111037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41296 + ... + 64261.

It is an arithmetic number, because the mean of its divisors is an integer number (303057018).

Almost surely, 2^1212111031 is an apocalyptic number.

1212111031 is a deficient number, since it is larger than the sum of its proper divisors (117041).

1212111031 is a wasteful number, since it uses less digits than its factorization.

1212111031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117040.

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

The square root of 1212111031 is about 34815.3849756110. The cubic root of 1212111031 is about 1066.2215790287.

Adding to 1212111031 its reverse (1301112121), we get a palindrome (2513223152).

The spelling of 1212111031 in words is "one billion, two hundred twelve million, one hundred eleven thousand, thirty-one".