1630042261 has 2 divisors, whose sum is σ = 1630042262. Its totient is φ = 1630042260.

The previous prime is 1630042163. The next prime is 1630042273. The reversal of 1630042261 is 1622400361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1296432036 + 333610225 = 36006^2 + 18265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630042261 - 2¹⁹ = 1629517973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1630042291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815021130 + 815021131.

It is an arithmetic number, because the mean of its divisors is an integer number (815021131).

Almost surely, 2^1630042261 is an apocalyptic number.

It is an amenable number.

1630042261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630042261 is an equidigital number, since it uses as much as digits as its factorization.

1630042261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1630042261 is about 40373.7818515927. The cubic root of 1630042261 is about 1176.8820927287.

The spelling of 1630042261 in words is "one billion, six hundred thirty million, forty-two thousand, two hundred sixty-one".