649771001 has 4 divisors (see below), whose sum is σ = 708841104. Its totient is φ = 590700900.

The previous prime is 649770997. The next prime is 649771021. The reversal of 649771001 is 100177946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649771001 - 2² = 649770997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649771021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29535035 + ... + 29535056.

It is an arithmetic number, because the mean of its divisors is an integer number (177210276).

Almost surely, 2^649771001 is an apocalyptic number.

It is an amenable number.

649771001 is a deficient number, since it is larger than the sum of its proper divisors (59070103).

649771001 is a wasteful number, since it uses less digits than its factorization.

649771001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59070102.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 649771001 is about 25490.6061324559. The cubic root of 649771001 is about 866.1373662697.

The spelling of 649771001 in words is "six hundred forty-nine million, seven hundred seventy-one thousand, one".