1630261 has 2 divisors, whose sum is σ = 1630262. Its totient is φ = 1630260.

The previous prime is 1630253. The next prime is 1630273. The reversal of 1630261 is 1620361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1232100 + 398161 = 1110^2 + 631^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630261 - 2³ = 1630253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1630361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815130 + 815131.

It is an arithmetic number, because the mean of its divisors is an integer number (815131).

2^1630261 is an apocalyptic number.

It is an amenable number.

1630261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630261 is an equidigital number, since it uses as much as digits as its factorization.

1630261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1630261 is about 1276.8167448777. The cubic root of 1630261 is about 117.6934733183.

It can be divided in two parts, 1630 and 261, that added together give a triangular number (1891 = T₆₁).

The spelling of 1630261 in words is "one million, six hundred thirty thousand, two hundred sixty-one".