427080781 has 2 divisors, whose sum is σ = 427080782. Its totient is φ = 427080780.

The previous prime is 427080779. The next prime is 427080793. The reversal of 427080781 is 187080724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235008900 + 192071881 = 15330^2 + 13859^2 .

It is a cyclic number.

It is not a de Polignac number, because 427080781 - 2¹ = 427080779 is a prime.

It is a super-2 number, since 2×427080781² = 364795986999139922, which contains 22 as substring.

Together with 427080779, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 427080781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427080481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213540390 + 213540391.

It is an arithmetic number, because the mean of its divisors is an integer number (213540391).

Almost surely, 2^427080781 is an apocalyptic number.

It is an amenable number.

427080781 is a deficient number, since it is larger than the sum of its proper divisors (1).

427080781 is an equidigital number, since it uses as much as digits as its factorization.

427080781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 427080781 is about 20665.9328606284. The cubic root of 427080781 is about 753.0723046663.

The spelling of 427080781 in words is "four hundred twenty-seven million, eighty thousand, seven hundred eighty-one".