121512431 has 2 divisors, whose sum is σ = 121512432. Its totient is φ = 121512430.

The previous prime is 121512401. The next prime is 121512439. The reversal of 121512431 is 134215121.

It is a strong prime.

It is an emirp because it is prime and its reverse (134215121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121512431 - 2¹⁰ = 121511407 is a prime.

It is a super-2 number, since 2×121512431² = 29530541775059522, 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 (121512439) 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 as a sum of consecutive naturals, namely, 60756215 + 60756216.

It is an arithmetic number, because the mean of its divisors is an integer number (60756216).

Almost surely, 2^121512431 is an apocalyptic number.

121512431 is a deficient number, since it is larger than the sum of its proper divisors (1).

121512431 is an equidigital number, since it uses as much as digits as its factorization.

121512431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 121512431 is about 11023.2677097129. The cubic root of 121512431 is about 495.3059782222.

Adding to 121512431 its reverse (134215121), we get a palindrome (255727552).

The spelling of 121512431 in words is "one hundred twenty-one million, five hundred twelve thousand, four hundred thirty-one".