649210631 has 2 divisors, whose sum is σ = 649210632. Its totient is φ = 649210630.

The previous prime is 649210613. The next prime is 649210633. The reversal of 649210631 is 136012946.

Together with previous prime (649210613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649210631 - 2⁶ = 649210567 is a prime.

It is a super-2 number, since 2×649210631² = 842948886806836322, which contains 22 as substring.

Together with 649210633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649210633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324605315 + 324605316.

It is an arithmetic number, because the mean of its divisors is an integer number (324605316).

Almost surely, 2^649210631 is an apocalyptic number.

649210631 is a deficient number, since it is larger than the sum of its proper divisors (1).

649210631 is an equidigital number, since it uses as much as digits as its factorization.

649210631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 649210631 is about 25479.6120653357. The cubic root of 649210631 is about 865.8883057094. Note that the first 3 decimals are identical.

The spelling of 649210631 in words is "six hundred forty-nine million, two hundred ten thousand, six hundred thirty-one".