427490981 has 2 divisors, whose sum is σ = 427490982. Its totient is φ = 427490980.

The previous prime is 427490977. The next prime is 427491011. The reversal of 427490981 is 189094724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389865025 + 37625956 = 19745^2 + 6134^2 .

It is a cyclic number.

It is not a de Polignac number, because 427490981 - 2² = 427490977 is a prime.

It is a super-2 number, since 2×427490981² = 365497077672684722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427490911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213745490 + 213745491.

It is an arithmetic number, because the mean of its divisors is an integer number (213745491).

Almost surely, 2^427490981 is an apocalyptic number.

It is an amenable number.

427490981 is a deficient number, since it is larger than the sum of its proper divisors (1).

427490981 is an equidigital number, since it uses as much as digits as its factorization.

427490981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 427490981 is about 20675.8550246417. The cubic root of 427490981 is about 753.3133296478.

The spelling of 427490981 in words is "four hundred twenty-seven million, four hundred ninety thousand, nine hundred eighty-one".