1028139631 has 2 divisors, whose sum is σ = 1028139632. Its totient is φ = 1028139630.

The previous prime is 1028139601. The next prime is 1028139641. The reversal of 1028139631 is 1369318201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1028139631 - 2¹⁹ = 1027615343 is a prime.

It is a super-2 number, since 2×1028139631² = 2114142201665632322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1028139601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514069815 + 514069816.

It is an arithmetic number, because the mean of its divisors is an integer number (514069816).

Almost surely, 2^1028139631 is an apocalyptic number.

1028139631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028139631 is an equidigital number, since it uses as much as digits as its factorization.

1028139631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1028139631 is about 32064.6164954456. The cubic root of 1028139631 is about 1009.2932450610.

The spelling of 1028139631 in words is "one billion, twenty-eight million, one hundred thirty-nine thousand, six hundred thirty-one".