649097387 has 4 divisors (see below), whose sum is σ = 649366176. Its totient is φ = 648828600.

The previous prime is 649097359. The next prime is 649097419. The reversal of 649097387 is 783790946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 649097387 - 2¹⁴ = 649081003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649097347) 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, 130739 + ... + 135612.

It is an arithmetic number, because the mean of its divisors is an integer number (162341544).

Almost surely, 2^649097387 is an apocalyptic number.

649097387 is a deficient number, since it is larger than the sum of its proper divisors (268789).

649097387 is a wasteful number, since it uses less digits than its factorization.

649097387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268788.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 649097387 is about 25477.3897210841. The cubic root of 649097387 is about 865.8379561759.

The spelling of 649097387 in words is "six hundred forty-nine million, ninety-seven thousand, three hundred eighty-seven".