649497967 has 4 divisors (see below), whose sum is σ = 649561680. Its totient is φ = 649434256.

The previous prime is 649497941. The next prime is 649498013. The reversal of 649497967 is 769794946.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 4-Lehmer number, since φ(649497967) divides (649497967-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 649497967 - 2⁷ = 649497839 is a prime.

It is a deceptive number, since it divides R_649497966.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649497907) 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, 12742 + ... + 38227.

It is an arithmetic number, because the mean of its divisors is an integer number (162390420).

Almost surely, 2^649497967 is an apocalyptic number.

649497967 is the 12743-rd decagonal number.

649497967 is a deficient number, since it is larger than the sum of its proper divisors (63713).

649497967 is a wasteful number, since it uses less digits than its factorization.

649497967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63712.

The product of its digits is 20575296, while the sum is 61.

The square root of 649497967 is about 25485.2499889642. The cubic root of 649497967 is about 866.0160321993.

The spelling of 649497967 in words is "six hundred forty-nine million, four hundred ninety-seven thousand, nine hundred sixty-seven".