424392820981 has 2 divisors, whose sum is σ = 424392820982. Its totient is φ = 424392820980.

The previous prime is 424392820967. The next prime is 424392820987. The reversal of 424392820981 is 189028293424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279163232881 + 145229588100 = 528359^2 + 381090^2 .

It is a cyclic number.

It is not a de Polignac number, because 424392820981 - 2⁵ = 424392820949 is a prime.

It is a super-2 number, since 2×424392820981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424392820987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212196410490 + 212196410491.

It is an arithmetic number, because the mean of its divisors is an integer number (212196410491).

Almost surely, 2^424392820981 is an apocalyptic number.

It is an amenable number.

424392820981 is a deficient number, since it is larger than the sum of its proper divisors (1).

424392820981 is an equidigital number, since it uses as much as digits as its factorization.

424392820981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1990656, while the sum is 52.

The spelling of 424392820981 in words is "four hundred twenty-four billion, three hundred ninety-two million, eight hundred twenty thousand, nine hundred eighty-one".