121650815 has 16 divisors (see below), whose sum is σ = 171503136. Its totient is φ = 81667200.

The previous prime is 121650799. The next prime is 121650817. The reversal of 121650815 is 518056121.

It is not a de Polignac number, because 121650815 - 2⁴ = 121650799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121650817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84356 + ... + 85785.

It is an arithmetic number, because the mean of its divisors is an integer number (10718946).

Almost surely, 2^121650815 is an apocalyptic number.

121650815 is a deficient number, since it is larger than the sum of its proper divisors (49852321).

121650815 is a wasteful number, since it uses less digits than its factorization.

121650815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170170.

The product of its (nonzero) digits is 2400, while the sum is 29.

The square root of 121650815 is about 11029.5428282409. The cubic root of 121650815 is about 495.4939327072.

The spelling of 121650815 in words is "one hundred twenty-one million, six hundred fifty thousand, eight hundred fifteen".