121131287 has 2 divisors, whose sum is σ = 121131288. Its totient is φ = 121131286.

The previous prime is 121131281. The next prime is 121131293. The reversal of 121131287 is 782131121.

It is a balanced prime because it is at equal distance from previous prime (121131281) and next prime (121131293).

It is a cyclic number.

It is not a de Polignac number, because 121131287 - 2⁶ = 121131223 is a prime.

It is a super-3 number, since 3×121131287³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121131281) 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 as a sum of consecutive naturals, namely, 60565643 + 60565644.

It is an arithmetic number, because the mean of its divisors is an integer number (60565644).

Almost surely, 2^121131287 is an apocalyptic number.

121131287 is a deficient number, since it is larger than the sum of its proper divisors (1).

121131287 is an equidigital number, since it uses as much as digits as its factorization.

121131287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 26.

The square root of 121131287 is about 11005.9659730530. The cubic root of 121131287 is about 494.7875658867.

The spelling of 121131287 in words is "one hundred twenty-one million, one hundred thirty-one thousand, two hundred eighty-seven".