121615650 has 72 divisors (see below), whose sum is σ = 351891540. Its totient is φ = 29934720.

The previous prime is 121615619. The next prime is 121615661. The reversal of 121615650 is 56516121.

It is a happy number.

121615650 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 1 + 5 + 650 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 46498761 + 75116889 = 6819^2 + 8667^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4545 + ... + 16244.

Almost surely, 2^121615650 is an apocalyptic number.

121615650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121615650 is an abundant number, since it is smaller than the sum of its proper divisors (230275890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121615650 is a wasteful number, since it uses less digits than its factorization.

121615650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20820 (or 20812 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 121615650 is about 11027.9485852991. The cubic root of 121615650 is about 495.4461847786.

It can be divided in two parts, 121615 and 650, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 121615650 in words is "one hundred twenty-one million, six hundred fifteen thousand, six hundred fifty".