111212001031 has 2 divisors, whose sum is σ = 111212001032. Its totient is φ = 111212001030.

The previous prime is 111212001029. The next prime is 111212001053. The reversal of 111212001031 is 130100212111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111212001031 - 2¹ = 111212001029 is a prime.

It is a super-2 number, since 2×111212001031² (a number of 23 digits) contains 22 as substring.

Together with 111212001029, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111212001001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606000515 + 55606000516.

It is an arithmetic number, because the mean of its divisors is an integer number (55606000516).

Almost surely, 2^111212001031 is an apocalyptic number.

111212001031 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212001031 is an equidigital number, since it uses as much as digits as its factorization.

111212001031 is an evil number, because the sum of its binary digits is even.

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

Adding to 111212001031 its reverse (130100212111), we get a palindrome (241312213142).

The spelling of 111212001031 in words is "one hundred eleven billion, two hundred twelve million, one thousand, thirty-one".