649797457 has 4 divisors (see below), whose sum is σ = 649855216. Its totient is φ = 649739700.

The previous prime is 649797451. The next prime is 649797481. The reversal of 649797457 is 754797946.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 649797457 - 2⁷ = 649797329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649797451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5919 + ... + 36532.

It is an arithmetic number, because the mean of its divisors is an integer number (162463804).

Almost surely, 2^649797457 is an apocalyptic number.

It is an amenable number.

649797457 is a deficient number, since it is larger than the sum of its proper divisors (57759).

649797457 is a wasteful number, since it uses less digits than its factorization.

649797457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57758.

The product of its digits is 13335840, while the sum is 58.

The square root of 649797457 is about 25491.1250634412. The cubic root of 649797457 is about 866.1491212927.

The spelling of 649797457 in words is "six hundred forty-nine million, seven hundred ninety-seven thousand, four hundred fifty-seven".