121520687 has 2 divisors, whose sum is σ = 121520688. Its totient is φ = 121520686.

The previous prime is 121520683. The next prime is 121520717. The reversal of 121520687 is 786025121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121520687 - 2² = 121520683 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121520683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60760343 + 60760344.

It is an arithmetic number, because the mean of its divisors is an integer number (60760344).

Almost surely, 2^121520687 is an apocalyptic number.

121520687 is a deficient number, since it is larger than the sum of its proper divisors (1).

121520687 is an equidigital number, since it uses as much as digits as its factorization.

121520687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 121520687 is about 11023.6421839608. The cubic root of 121520687 is about 495.3171956028.

The spelling of 121520687 in words is "one hundred twenty-one million, five hundred twenty thousand, six hundred eighty-seven".