649487143 has 2 divisors, whose sum is σ = 649487144. Its totient is φ = 649487142.

The previous prime is 649487131. The next prime is 649487183. The reversal of 649487143 is 341784946.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649487143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 649487093 and 649487102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649487183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324743571 + 324743572.

It is an arithmetic number, because the mean of its divisors is an integer number (324743572).

Almost surely, 2^649487143 is an apocalyptic number.

649487143 is a deficient number, since it is larger than the sum of its proper divisors (1).

649487143 is an equidigital number, since it uses as much as digits as its factorization.

649487143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 46.

The square root of 649487143 is about 25485.0376299506. The cubic root of 649487143 is about 866.0112214018.

The spelling of 649487143 in words is "six hundred forty-nine million, four hundred eighty-seven thousand, one hundred forty-three".