649549123 has 2 divisors, whose sum is σ = 649549124. Its totient is φ = 649549122.

The previous prime is 649549091. The next prime is 649549127. The reversal of 649549123 is 321945946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649549123 - 2⁵ = 649549091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649549123.

It is not a weakly prime, because it can be changed into another prime (649549127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324774561 + 324774562.

It is an arithmetic number, because the mean of its divisors is an integer number (324774562).

Almost surely, 2^649549123 is an apocalyptic number.

649549123 is a deficient number, since it is larger than the sum of its proper divisors (1).

649549123 is an equidigital number, since it uses as much as digits as its factorization.

649549123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The square root of 649549123 is about 25486.2536085632. The cubic root of 649549123 is about 866.0387680945.

The spelling of 649549123 in words is "six hundred forty-nine million, five hundred forty-nine thousand, one hundred twenty-three".