1215650550 has 24 divisors (see below), whose sum is σ = 3014813736. Its totient is φ = 324173440.

The previous prime is 1215650539. The next prime is 1215650563. The reversal of 1215650550 is 550565121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4052019 + ... + 4052318.

It is an arithmetic number, because the mean of its divisors is an integer number (125617239).

Almost surely, 2^1215650550 is an apocalyptic number.

1215650550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1215650550 is an abundant number, since it is smaller than the sum of its proper divisors (1799163186).

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

1215650550 is a wasteful number, since it uses less digits than its factorization.

1215650550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8104352 (or 8104347 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 1215650550 is about 34866.1806052800. The cubic root of 1215650550 is about 1067.2584048513.

The spelling of 1215650550 in words is "one billion, two hundred fifteen million, six hundred fifty thousand, five hundred fifty".