649219952531 has 8 divisors (see below), whose sum is σ = 660665982960. Its totient is φ = 637788665632.

The previous prime is 649219952527. The next prime is 649219952567. The reversal of 649219952531 is 135259912946.

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 649219952531 - 2² = 649219952527 is a prime.

It is a super-2 number, since 2×649219952531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649219958531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3597020 + ... + 3773193.

It is an arithmetic number, because the mean of its divisors is an integer number (82583247870).

Almost surely, 2^649219952531 is an apocalyptic number.

649219952531 is a deficient number, since it is larger than the sum of its proper divisors (11446030429).

649219952531 is a wasteful number, since it uses less digits than its factorization.

649219952531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7371765.

The product of its digits is 5248800, while the sum is 56.

The spelling of 649219952531 in words is "six hundred forty-nine billion, two hundred nineteen million, nine hundred fifty-two thousand, five hundred thirty-one".