649929899 has 6 divisors (see below), whose sum is σ = 661144860. Its totient is φ = 638721636.

The previous prime is 649929881. The next prime is 649929947. The reversal of 649929899 is 998929946.

It is not a de Polignac number, because 649929899 - 2¹⁶ = 649864363 is a prime.

It is a super-2 number, since 2×649929899² = 844817747228300402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649929859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 194162 + ... + 197480.

It is an arithmetic number, because the mean of its divisors is an integer number (110190810).

Almost surely, 2^649929899 is an apocalyptic number.

649929899 is a deficient number, since it is larger than the sum of its proper divisors (11214961).

649929899 is an frugal number, since it uses more digits than its factorization.

649929899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6697 (or 3378 counting only the distinct ones).

The product of its digits is 22674816, while the sum is 65.

The square root of 649929899 is about 25493.7227371759. The cubic root of 649929899 is about 866.2079635919.

The spelling of 649929899 in words is "six hundred forty-nine million, nine hundred twenty-nine thousand, eight hundred ninety-nine".