121681607 has 2 divisors, whose sum is σ = 121681608. Its totient is φ = 121681606.

The previous prime is 121681591. The next prime is 121681639. The reversal of 121681607 is 706186121.

It is a happy number.

It is an a-pointer prime, because the next prime (121681639) can be obtained adding 121681607 to its sum of digits (32).

It is a weak prime.

It is an emirp because it is prime and its reverse (706186121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121681607 - 2⁴ = 121681591 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121681667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60840803 + 60840804.

It is an arithmetic number, because the mean of its divisors is an integer number (60840804).

Almost surely, 2^121681607 is an apocalyptic number.

121681607 is a deficient number, since it is larger than the sum of its proper divisors (1).

121681607 is an equidigital number, since it uses as much as digits as its factorization.

121681607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 121681607 is about 11030.9386273336. The cubic root of 121681607 is about 495.5357353099.

The spelling of 121681607 in words is "one hundred twenty-one million, six hundred eighty-one thousand, six hundred seven".