649949951 has 4 divisors (see below), whose sum is σ = 742799952. Its totient is φ = 557099952.

The previous prime is 649949921. The next prime is 649949977. The reversal of 649949951 is 159949946.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649949951 is a prime.

It is a super-3 number, since 3×649949951³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649949921) 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, 46424990 + ... + 46425003.

It is an arithmetic number, because the mean of its divisors is an integer number (185699988).

Almost surely, 2^649949951 is an apocalyptic number.

649949951 is a deficient number, since it is larger than the sum of its proper divisors (92850001).

649949951 is an equidigital number, since it uses as much as digits as its factorization.

649949951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92850000.

The product of its digits is 3149280, while the sum is 56.

The square root of 649949951 is about 25494.1160074241. The cubic root of 649949951 is about 866.2168717441.

The spelling of 649949951 in words is "six hundred forty-nine million, nine hundred forty-nine thousand, nine hundred fifty-one".