649021903 has 16 divisors (see below), whose sum is σ = 705118176. Its totient is φ = 595123200.

The previous prime is 649021873. The next prime is 649021939. The reversal of 649021903 is 309120946.

It is a cyclic number.

It is not a de Polignac number, because 649021903 - 2⁵ = 649021871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649021963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99853 + ... + 106153.

It is an arithmetic number, because the mean of its divisors is an integer number (44069886).

Almost surely, 2^649021903 is an apocalyptic number.

649021903 is a deficient number, since it is larger than the sum of its proper divisors (56096273).

649021903 is a wasteful number, since it uses less digits than its factorization.

649021903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6474.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 649021903 is about 25475.9082860651. The cubic root of 649021903 is about 865.8043919027.

The spelling of 649021903 in words is "six hundred forty-nine million, twenty-one thousand, nine hundred three".