649179899 has 8 divisors (see below), whose sum is σ = 677676192. Its totient is φ = 620706240.

The previous prime is 649179887. The next prime is 649179907. The reversal of 649179899 is 998971946.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 649179899 - 2²⁸ = 380744443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649179809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82079 + ... + 89639.

It is an arithmetic number, because the mean of its divisors is an integer number (84709524).

Almost surely, 2^649179899 is an apocalyptic number.

649179899 is a deficient number, since it is larger than the sum of its proper divisors (28496293).

649179899 is a wasteful number, since it uses less digits than its factorization.

649179899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11317.

The product of its digits is 8817984, while the sum is 62.

The square root of 649179899 is about 25479.0089877923. The cubic root of 649179899 is about 865.8746425016.

The spelling of 649179899 in words is "six hundred forty-nine million, one hundred seventy-nine thousand, eight hundred ninety-nine".