1020133231 has 4 divisors (see below), whose sum is σ = 1098605032. Its totient is φ = 941661432.

The previous prime is 1020133217. The next prime is 1020133243. The reversal of 1020133231 is 1323310201.

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 1020133231 - 2¹⁵ = 1020100463 is a prime.

It is a super-2 number, since 2×1020133231² = 2081343617980998722, 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 (1020133271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39235881 + ... + 39235906.

It is an arithmetic number, because the mean of its divisors is an integer number (274651258).

Almost surely, 2^1020133231 is an apocalyptic number.

1020133231 is a deficient number, since it is larger than the sum of its proper divisors (78471801).

1020133231 is an equidigital number, since it uses as much as digits as its factorization.

1020133231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78471800.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1020133231 is about 31939.5245894487. The cubic root of 1020133231 is about 1006.6665355442. Note that the first 3 decimals are identical.

Adding to 1020133231 its reverse (1323310201), we get a palindrome (2343443432).

The spelling of 1020133231 in words is "one billion, twenty million, one hundred thirty-three thousand, two hundred thirty-one".