649766141 has 4 divisors (see below), whose sum is σ = 672171900. Its totient is φ = 627360384.

The previous prime is 649766119. The next prime is 649766171. The reversal of 649766141 is 141667946.

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

It can be written as a sum of positive squares in 2 ways, for example, as 162460516 + 487305625 = 12746^2 + 22075^2 .

It is a cyclic number.

It is not a de Polignac number, because 649766141 - 2¹⁴ = 649749757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649766092 and 649766101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649766101) 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, 11202836 + ... + 11202893.

It is an arithmetic number, because the mean of its divisors is an integer number (168042975).

Almost surely, 2^649766141 is an apocalyptic number.

It is an amenable number.

649766141 is a deficient number, since it is larger than the sum of its proper divisors (22405759).

649766141 is a wasteful number, since it uses less digits than its factorization.

649766141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22405758.

The product of its digits is 217728, while the sum is 44.

The square root of 649766141 is about 25490.5108030420. The cubic root of 649766141 is about 866.1352068227.

It can be divided in two parts, 64976 and 6141, that added together give a palindrome (71117).

The spelling of 649766141 in words is "six hundred forty-nine million, seven hundred sixty-six thousand, one hundred forty-one".