650121999 has 4 divisors (see below), whose sum is σ = 866829336. Its totient is φ = 433414664.

The previous prime is 650121991. The next prime is 650122019. The reversal of 650121999 is 999121056.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 650121999 - 2³ = 650121991 is a prime.

It is a super-2 number, since 2×650121999² = 845317227167512002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 650121999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650121991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108353664 + ... + 108353669.

It is an arithmetic number, because the mean of its divisors is an integer number (216707334).

Almost surely, 2^650121999 is an apocalyptic number.

650121999 is a deficient number, since it is larger than the sum of its proper divisors (216707337).

650121999 is a wasteful number, since it uses less digits than its factorization.

650121999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216707336.

The product of its (nonzero) digits is 43740, while the sum is 42.

The square root of 650121999 is about 25497.4900529444. The cubic root of 650121999 is about 866.2932969786.

The spelling of 650121999 in words is "six hundred fifty million, one hundred twenty-one thousand, nine hundred ninety-nine".