1212113031 has 4 divisors (see below), whose sum is σ = 1616150712. Its totient is φ = 808075352.

The previous prime is 1212112991. The next prime is 1212113047. The reversal of 1212113031 is 1303112121.

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 1212113031 - 2²² = 1207918727 is a prime.

It is a super-2 number, since 2×1212113031² = 2938435999840013922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1212113031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212113131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202018836 + ... + 202018841.

It is an arithmetic number, because the mean of its divisors is an integer number (404037678).

Almost surely, 2^1212113031 is an apocalyptic number.

1212113031 is a deficient number, since it is larger than the sum of its proper divisors (404037681).

1212113031 is an equidigital number, since it uses as much as digits as its factorization.

1212113031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404037680.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1212113031 is about 34815.4136985330. The cubic root of 1212113031 is about 1066.2221654551. Note that the first 3 decimals are identical.

Adding to 1212113031 its reverse (1303112121), we get a palindrome (2515225152).

It can be divided in two parts, 12121 and 13031, that added together give a palindrome (25152).

The spelling of 1212113031 in words is "one billion, two hundred twelve million, one hundred thirteen thousand, thirty-one".