649697545 has 8 divisors (see below), whose sum is σ = 891013824. Its totient is φ = 445506864.

The previous prime is 649697539. The next prime is 649697567. The reversal of 649697545 is 545796946.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 649697545 - 2⁷ = 649697417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9281359 + ... + 9281428.

It is an arithmetic number, because the mean of its divisors is an integer number (111376728).

Almost surely, 2^649697545 is an apocalyptic number.

It is an amenable number.

649697545 is a deficient number, since it is larger than the sum of its proper divisors (241316279).

649697545 is a wasteful number, since it uses less digits than its factorization.

649697545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18562799.

The product of its digits is 8164800, while the sum is 55.

The square root of 649697545 is about 25489.1652472183. The cubic root of 649697545 is about 866.1047263684.

The spelling of 649697545 in words is "six hundred forty-nine million, six hundred ninety-seven thousand, five hundred forty-five".