649123963 has 8 divisors (see below), whose sum is σ = 679045536. Its totient is φ = 619344000.

The previous prime is 649123933. The next prime is 649124027. The reversal of 649123963 is 369321946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649123963 - 2⁹ = 649123451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649123933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25968 + ... + 44413.

It is an arithmetic number, because the mean of its divisors is an integer number (84880692).

Almost surely, 2^649123963 is an apocalyptic number.

649123963 is a deficient number, since it is larger than the sum of its proper divisors (29921573).

649123963 is a wasteful number, since it uses less digits than its factorization.

649123963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70805.

The product of its digits is 209952, while the sum is 43.

The square root of 649123963 is about 25477.9112762408. The cubic root of 649123963 is about 865.8497726849.

The spelling of 649123963 in words is "six hundred forty-nine million, one hundred twenty-three thousand, nine hundred sixty-three".