1023128231 has 4 divisors (see below), whose sum is σ = 1023573264. Its totient is φ = 1022683200.

The previous prime is 1023128213. The next prime is 1023128233. The reversal of 1023128231 is 1328213201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1023128231 - 2¹⁴ = 1023111847 is a prime.

It is a super-2 number, since 2×1023128231² = 2093582754138378722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1023128197 and 1023128206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023128233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219050 + ... + 223671.

It is an arithmetic number, because the mean of its divisors is an integer number (255893316).

Almost surely, 2^1023128231 is an apocalyptic number.

1023128231 is a deficient number, since it is larger than the sum of its proper divisors (445033).

1023128231 is an equidigital number, since it uses as much as digits as its factorization.

1023128231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445032.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1023128231 is about 31986.3757090421. The cubic root of 1023128231 is about 1007.6507274282.

The spelling of 1023128231 in words is "one billion, twenty-three million, one hundred twenty-eight thousand, two hundred thirty-one".