649167919 has 2 divisors, whose sum is σ = 649167920. Its totient is φ = 649167918.

The previous prime is 649167913. The next prime is 649167943. The reversal of 649167919 is 919761946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649167919 - 2⁷ = 649167791 is a prime.

It is a super-2 number, since 2×649167919² = 842837974117581122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649167913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324583959 + 324583960.

It is an arithmetic number, because the mean of its divisors is an integer number (324583960).

Almost surely, 2^649167919 is an apocalyptic number.

649167919 is a deficient number, since it is larger than the sum of its proper divisors (1).

649167919 is an equidigital number, since it uses as much as digits as its factorization.

649167919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 52.

The square root of 649167919 is about 25478.7738912217. The cubic root of 649167919 is about 865.8693161701.

The spelling of 649167919 in words is "six hundred forty-nine million, one hundred sixty-seven thousand, nine hundred nineteen".