649261 has 2 divisors, whose sum is σ = 649262. Its totient is φ = 649260.

The previous prime is 649217. The next prime is 649273. The reversal of 649261 is 162946.

649261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504100 + 145161 = 710^2 + 381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649261 is a prime.

It is a super-2 number, since 2×649261² = 843079692242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324630 + 324631.

It is an arithmetic number, because the mean of its divisors is an integer number (324631).

2⁶⁴⁹²⁶¹ is an apocalyptic number.

It is an amenable number.

649261 is a deficient number, since it is larger than the sum of its proper divisors (1).

649261 is an equidigital number, since it uses as much as digits as its factorization.

649261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 649261 is about 805.7673361461. The cubic root of 649261 is about 86.5910698442.

It can be divided in two parts, 64 and 9261, that multiplied together give a cube (592704 = 84³).

The spelling of 649261 in words is "six hundred forty-nine thousand, two hundred sixty-one".