1823131021 has 2 divisors, whose sum is σ = 1823131022. Its totient is φ = 1823131020.

The previous prime is 1823130961. The next prime is 1823131027. The reversal of 1823131021 is 1201313281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935686921 + 887444100 = 30589^2 + 29790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1823131021 - 2¹⁷ = 1822999949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1823130983 and 1823131001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1823131027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 911565510 + 911565511.

It is an arithmetic number, because the mean of its divisors is an integer number (911565511).

Almost surely, 2^1823131021 is an apocalyptic number.

It is an amenable number.

1823131021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1823131021 is an equidigital number, since it uses as much as digits as its factorization.

1823131021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1823131021 is about 42698.1383786226. The cubic root of 1823131021 is about 1221.6288868810.

The spelling of 1823131021 in words is "one billion, eight hundred twenty-three million, one hundred thirty-one thousand, twenty-one".