12121631 has 2 divisors, whose sum is σ = 12121632. Its totient is φ = 12121630.

The previous prime is 12121619. The next prime is 12121661. The reversal of 12121631 is 13612121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12121631 - 2¹⁸ = 11859487 is a prime.

It is a super-2 number, since 2×12121631² = 293867876200322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060815 + 6060816.

It is an arithmetic number, because the mean of its divisors is an integer number (6060816).

Almost surely, 2^12121631 is an apocalyptic number.

12121631 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121631 is an equidigital number, since it uses as much as digits as its factorization.

12121631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 17.

The square root of 12121631 is about 3481.6132754802. The cubic root of 12121631 is about 229.7137649111.

Adding to 12121631 its reverse (13612121), we get a palindrome (25733752).

The spelling of 12121631 in words is "twelve million, one hundred twenty-one thousand, six hundred thirty-one".