649756141 has 4 divisors (see below), whose sum is σ = 678006432. Its totient is φ = 621505852.

The previous prime is 649756139. The next prime is 649756181. The reversal of 649756141 is 141657946.

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 an emirpimes, since its reverse is a distinct semiprime: 141657946 = 2 ⋅70828973.

It is a cyclic number.

It is not a de Polignac number, because 649756141 - 2¹ = 649756139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649756181) 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, 14125111 + ... + 14125156.

It is an arithmetic number, because the mean of its divisors is an integer number (169501608).

Almost surely, 2^649756141 is an apocalyptic number.

It is an amenable number.

649756141 is a deficient number, since it is larger than the sum of its proper divisors (28250291).

649756141 is a wasteful number, since it uses less digits than its factorization.

649756141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28250290.

The product of its digits is 181440, while the sum is 43.

The square root of 649756141 is about 25490.3146508630. The cubic root of 649756141 is about 866.1307634823.

The spelling of 649756141 in words is "six hundred forty-nine million, seven hundred fifty-six thousand, one hundred forty-one".