1042506581 has 2 divisors, whose sum is σ = 1042506582. Its totient is φ = 1042506580.

The previous prime is 1042506557. The next prime is 1042506593. The reversal of 1042506581 is 1856052401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 880071556 + 162435025 = 29666^2 + 12745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1042506581 - 2¹⁰ = 1042505557 is a prime.

It is a super-2 number, since 2×1042506581² = 2173639942856619122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1042506511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521253290 + 521253291.

It is an arithmetic number, because the mean of its divisors is an integer number (521253291).

Almost surely, 2^1042506581 is an apocalyptic number.

It is an amenable number.

1042506581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1042506581 is an equidigital number, since it uses as much as digits as its factorization.

1042506581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 1042506581 is about 32287.8704934221. The cubic root of 1042506581 is about 1013.9727142605.

Adding to 1042506581 its reverse (1856052401), we get a palindrome (2898558982).

The spelling of 1042506581 in words is "one billion, forty-two million, five hundred six thousand, five hundred eighty-one".