121649687 has 2 divisors, whose sum is σ = 121649688. Its totient is φ = 121649686.

The previous prime is 121649683. The next prime is 121649699. The reversal of 121649687 is 786946121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121649687 - 2² = 121649683 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121649683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60824843 + 60824844.

It is an arithmetic number, because the mean of its divisors is an integer number (60824844).

Almost surely, 2^121649687 is an apocalyptic number.

121649687 is a deficient number, since it is larger than the sum of its proper divisors (1).

121649687 is an equidigital number, since it uses as much as digits as its factorization.

121649687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 121649687 is about 11029.4916927300. The cubic root of 121649687 is about 495.4924012231.

The spelling of 121649687 in words is "one hundred twenty-one million, six hundred forty-nine thousand, six hundred eighty-seven".