1581443141 has 2 divisors, whose sum is σ = 1581443142. Its totient is φ = 1581443140.

The previous prime is 1581443113. The next prime is 1581443147. The reversal of 1581443141 is 1413441851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1409702116 + 171741025 = 37546^2 + 13105^2 .

It is a cyclic number.

It is not a de Polignac number, because 1581443141 - 2²² = 1577248837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1581443098 and 1581443107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1581443147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 790721570 + 790721571.

It is an arithmetic number, because the mean of its divisors is an integer number (790721571).

Almost surely, 2^1581443141 is an apocalyptic number.

It is an amenable number.

1581443141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1581443141 is an equidigital number, since it uses as much as digits as its factorization.

1581443141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 32.

The square root of 1581443141 is about 39767.3627614404. The cubic root of 1581443141 is about 1165.0677853563.

Adding to 1581443141 its reverse (1413441851), we get a palindrome (2994884992).

The spelling of 1581443141 in words is "one billion, five hundred eighty-one million, four hundred forty-three thousand, one hundred forty-one".