649160069 has 4 divisors (see below), whose sum is σ = 649294380. Its totient is φ = 649025760.

The previous prime is 649160063. The next prime is 649160077. The reversal of 649160069 is 960061946.

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 506835169 + 142324900 = 22513^2 + 11930^2 .

It is a cyclic number.

It is not a de Polignac number, because 649160069 - 2⁸ = 649159813 is a prime.

It is a super-2 number, since 2×649160069² = 842817590368169522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649160063) 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, 59624 + ... + 69665.

It is an arithmetic number, because the mean of its divisors is an integer number (162323595).

Almost surely, 2^649160069 is an apocalyptic number.

It is an amenable number.

649160069 is a deficient number, since it is larger than the sum of its proper divisors (134311).

649160069 is a wasteful number, since it uses less digits than its factorization.

649160069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134310.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 649160069 is about 25478.6198409568. The cubic root of 649160069 is about 865.8658260091.

The spelling of 649160069 in words is "six hundred forty-nine million, one hundred sixty thousand, sixty-nine".