1028591231 has 16 divisors (see below), whose sum is σ = 1087067520. Its totient is φ = 971953920.

The previous prime is 1028591209. The next prime is 1028591233. The reversal of 1028591231 is 1321958201.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1028591231 - 2⁶ = 1028591167 is a prime.

It is a super-2 number, since 2×1028591231² = 2115999840980190722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028591233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361145 + ... + 363981.

It is an arithmetic number, because the mean of its divisors is an integer number (67941720).

Almost surely, 2^1028591231 is an apocalyptic number.

1028591231 is a deficient number, since it is larger than the sum of its proper divisors (58476289).

1028591231 is a wasteful number, since it uses less digits than its factorization.

1028591231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3154.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 1028591231 is about 32071.6577526014. The cubic root of 1028591231 is about 1009.4409974017.

The spelling of 1028591231 in words is "one billion, twenty-eight million, five hundred ninety-one thousand, two hundred thirty-one".