1603031561 has 2 divisors, whose sum is σ = 1603031562. Its totient is φ = 1603031560.

The previous prime is 1603031543. The next prime is 1603031567. The reversal of 1603031561 is 1651303061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1066414336 + 536617225 = 32656^2 + 23165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1603031561 - 2²⁶ = 1535922697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1603031561.

It is not a weakly prime, because it can be changed into another prime (1603031567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801515780 + 801515781.

It is an arithmetic number, because the mean of its divisors is an integer number (801515781).

Almost surely, 2^1603031561 is an apocalyptic number.

It is an amenable number.

1603031561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1603031561 is an equidigital number, since it uses as much as digits as its factorization.

1603031561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 1603031561 is about 40037.8765795590. The cubic root of 1603031561 is about 1170.3453240791.

The spelling of 1603031561 in words is "one billion, six hundred three million, thirty-one thousand, five hundred sixty-one".