1581323453 has 2 divisors, whose sum is σ = 1581323454. Its totient is φ = 1581323452.

The previous prime is 1581323417. The next prime is 1581323479. The reversal of 1581323453 is 3543231851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1549367044 + 31956409 = 39362^2 + 5653^2 .

It is a cyclic number.

It is not a de Polignac number, because 1581323453 - 2⁶ = 1581323389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1581323483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 790661726 + 790661727.

It is an arithmetic number, because the mean of its divisors is an integer number (790661727).

Almost surely, 2^1581323453 is an apocalyptic number.

It is an amenable number.

1581323453 is a deficient number, since it is larger than the sum of its proper divisors (1).

1581323453 is an equidigital number, since it uses as much as digits as its factorization.

1581323453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 35.

The square root of 1581323453 is about 39765.8578808505. The cubic root of 1581323453 is about 1165.0383927618.

The spelling of 1581323453 in words is "one billion, five hundred eighty-one million, three hundred twenty-three thousand, four hundred fifty-three".