649494813 has 8 divisors (see below), whose sum is σ = 944719776. Its totient is φ = 393633200.

The previous prime is 649494773. The next prime is 649494823. The reversal of 649494813 is 318494946.

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 649494813 - 2²⁰ = 648446237 is a prime.

It is a super-2 number, since 2×649494813² = 843687024227809938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649494823) 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, 9840798 + ... + 9840863.

It is an arithmetic number, because the mean of its divisors is an integer number (118089972).

Almost surely, 2^649494813 is an apocalyptic number.

It is an amenable number.

649494813 is a deficient number, since it is larger than the sum of its proper divisors (295224963).

649494813 is a wasteful number, since it uses less digits than its factorization.

649494813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19681675.

The product of its digits is 746496, while the sum is 48.

The square root of 649494813 is about 25485.1881099591. The cubic root of 649494813 is about 866.0146303889.

Adding to 649494813 its sum of digits (48), we get a triangular number (649494861 = T₃₆₀₄₁).

The spelling of 649494813 in words is "six hundred forty-nine million, four hundred ninety-four thousand, eight hundred thirteen".