525649 has 2 divisors, whose sum is σ = 525650. Its totient is φ = 525648.

The previous prime is 525641. The next prime is 525671. The reversal of 525649 is 946525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 360000 + 165649 = 600^2 + 407^2 .

It is a cyclic number.

It is not a de Polignac number, because 525649 - 2³ = 525641 is a prime.

It is a d-powerful number, because it can be written as 5³ + 2¹⁹ + 6 + 5³ + 4⁵ + 9² .

It is a self number, because there is not a number n which added to its sum of digits gives 525649.

It is not a weakly prime, because it can be changed into another prime (525641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262824 + 262825.

It is an arithmetic number, because the mean of its divisors is an integer number (262825).

2⁵²⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

525649 is a deficient number, since it is larger than the sum of its proper divisors (1).

525649 is an equidigital number, since it uses as much as digits as its factorization.

525649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 31.

The square root of 525649 is about 725.0165515352. The cubic root of 525649 is about 80.7046603650.

It can be divided in two parts, 525 and 649, that multiplied together give a triangular number (340725 = T₈₂₅).

The spelling of 525649 in words is "five hundred twenty-five thousand, six hundred forty-nine".