649697771 has 2 divisors, whose sum is σ = 649697772. Its totient is φ = 649697770.

The previous prime is 649697753. The next prime is 649697809. The reversal of 649697771 is 177796946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649697771 - 2¹⁴ = 649681387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (649697731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324848885 + 324848886.

It is an arithmetic number, because the mean of its divisors is an integer number (324848886).

Almost surely, 2^649697771 is an apocalyptic number.

649697771 is a deficient number, since it is larger than the sum of its proper divisors (1).

649697771 is an equidigital number, since it uses as much as digits as its factorization.

649697771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4000752, while the sum is 56.

The square root of 649697771 is about 25489.1696804741. The cubic root of 649697771 is about 866.1048267944.

The spelling of 649697771 in words is "six hundred forty-nine million, six hundred ninety-seven thousand, seven hundred seventy-one".