1042881391 has 2 divisors, whose sum is σ = 1042881392. Its totient is φ = 1042881390.

The previous prime is 1042881353. The next prime is 1042881403. The reversal of 1042881391 is 1931882401.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1042881391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1042881391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1042881311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521440695 + 521440696.

It is an arithmetic number, because the mean of its divisors is an integer number (521440696).

Almost surely, 2^1042881391 is an apocalyptic number.

1042881391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1042881391 is an equidigital number, since it uses as much as digits as its factorization.

1042881391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1042881391 is about 32293.6741638359. The cubic root of 1042881391 is about 1014.0942167952.

It can be divided in two parts, 10428 and 81391, that added together give a palindrome (91819).

The spelling of 1042881391 in words is "one billion, forty-two million, eight hundred eighty-one thousand, three hundred ninety-one".