1821734881 has 2 divisors, whose sum is σ = 1821734882. Its totient is φ = 1821734880.

The previous prime is 1821734869. The next prime is 1821734897. The reversal of 1821734881 is 1884371281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1814760000 + 6974881 = 42600^2 + 2641^2 .

It is a cyclic number.

It is not a de Polignac number, because 1821734881 - 2⁷ = 1821734753 is a prime.

It is a super-2 number, since 2×1821734881² = 6637435953304168322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1821734821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910867440 + 910867441.

It is an arithmetic number, because the mean of its divisors is an integer number (910867441).

Almost surely, 2^1821734881 is an apocalyptic number.

It is an amenable number.

1821734881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821734881 is an equidigital number, since it uses as much as digits as its factorization.

1821734881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 43.

The square root of 1821734881 is about 42681.7862911102. The cubic root of 1821734881 is about 1221.3169691802.

The spelling of 1821734881 in words is "one billion, eight hundred twenty-one million, seven hundred thirty-four thousand, eight hundred eighty-one".