649872701 has 2 divisors, whose sum is σ = 649872702. Its totient is φ = 649872700.

The previous prime is 649872607. The next prime is 649872703. The reversal of 649872701 is 107278946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 415752100 + 234120601 = 20390^2 + 15301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649872701 is a prime.

Together with 649872703, 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 (649872703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324936350 + 324936351.

It is an arithmetic number, because the mean of its divisors is an integer number (324936351).

Almost surely, 2^649872701 is an apocalyptic number.

It is an amenable number.

649872701 is a deficient number, since it is larger than the sum of its proper divisors (1).

649872701 is an equidigital number, since it uses as much as digits as its factorization.

649872701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 649872701 is about 25492.6009069298. The cubic root of 649872701 is about 866.1825522274.

The spelling of 649872701 in words is "six hundred forty-nine million, eight hundred seventy-two thousand, seven hundred one".