1630720361 has 2 divisors, whose sum is σ = 1630720362. Its totient is φ = 1630720360.

The previous prime is 1630720331. The next prime is 1630720363. The reversal of 1630720361 is 1630270361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1052029225 + 578691136 = 32435^2 + 24056^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630720361 - 2¹⁸ = 1630458217 is a prime.

Together with 1630720363, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1630720363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815360180 + 815360181.

It is an arithmetic number, because the mean of its divisors is an integer number (815360181).

Almost surely, 2^1630720361 is an apocalyptic number.

It is an amenable number.

1630720361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630720361 is an equidigital number, since it uses as much as digits as its factorization.

1630720361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 1630720361 is about 40382.1787549904. The cubic root of 1630720361 is about 1177.0452650033.

The spelling of 1630720361 in words is "one billion, six hundred thirty million, seven hundred twenty thousand, three hundred sixty-one".