1231022420 has 12 divisors (see below), whose sum is σ = 2585147124. Its totient is φ = 492408960.

The previous prime is 1231022413. The next prime is 1231022437. The reversal of 1231022420 is 242201321.

It can be written as a sum of positive squares in 2 ways, for example, as 934769476 + 296252944 = 30574^2 + 17212^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30775541 + ... + 30775580.

It is an arithmetic number, because the mean of its divisors is an integer number (215428927).

Almost surely, 2^1231022420 is an apocalyptic number.

1231022420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231022420 is an abundant number, since it is smaller than the sum of its proper divisors (1354124704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231022420 is a wasteful number, since it uses less digits than its factorization.

1231022420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61551130 (or 61551128 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1231022420 is about 35085.9290884537. The cubic root of 1231022420 is about 1071.7380609086.

Adding to 1231022420 its reverse (242201321), we get a palindrome (1473223741).

The spelling of 1231022420 in words is "one billion, two hundred thirty-one million, twenty-two thousand, four hundred twenty".