1405231561 has 2 divisors, whose sum is σ = 1405231562. Its totient is φ = 1405231560.

The previous prime is 1405231549. The next prime is 1405231573. The reversal of 1405231561 is 1651325041.

It is a balanced prime because it is at equal distance from previous prime (1405231549) and next prime (1405231573).

It can be written as a sum of positive squares in only one way, i.e., 786465936 + 618765625 = 28044^2 + 24875^2 .

It is an emirp because it is prime and its reverse (1651325041) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1405231561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1405231661) 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, 702615780 + 702615781.

It is an arithmetic number, because the mean of its divisors is an integer number (702615781).

Almost surely, 2^1405231561 is an apocalyptic number.

It is an amenable number.

1405231561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405231561 is an equidigital number, since it uses as much as digits as its factorization.

1405231561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1405231561 is about 37486.4183538518. The cubic root of 1405231561 is about 1120.0806598478.

The spelling of 1405231561 in words is "one billion, four hundred five million, two hundred thirty-one thousand, five hundred sixty-one".