5423521981 has 2 divisors, whose sum is σ = 5423521982. Its totient is φ = 5423521980.

The previous prime is 5423521927. The next prime is 5423521993. The reversal of 5423521981 is 1891253245.

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., 5139599481 + 283922500 = 71691^2 + 16850^2 .

It is a cyclic number.

It is not a de Polignac number, because 5423521981 - 2¹⁷ = 5423390909 is a prime.

It is a super-2 number, since 2×5423521981² = 58829181356780328722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5423521381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2711760990 + 2711760991.

It is an arithmetic number, because the mean of its divisors is an integer number (2711760991).

Almost surely, 2^5423521981 is an apocalyptic number.

It is an amenable number.

5423521981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5423521981 is an equidigital number, since it uses as much as digits as its factorization.

5423521981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 40.

The square root of 5423521981 is about 73644.5651830466. The cubic root of 5423521981 is about 1756.9543120304.

The spelling of 5423521981 in words is "five billion, four hundred twenty-three million, five hundred twenty-one thousand, nine hundred eighty-one".