428321494781 has 2 divisors, whose sum is σ = 428321494782. Its totient is φ = 428321494780.

The previous prime is 428321494747. The next prime is 428321494787. The reversal of 428321494781 is 187494123824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 291594600025 + 136726894756 = 539995^2 + 369766^2 .

It is a cyclic number.

It is not a de Polignac number, because 428321494781 - 2⁶ = 428321494717 is a prime.

It is a super-2 number, since 2×428321494781² (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 (428321494787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214160747390 + 214160747391.

It is an arithmetic number, because the mean of its divisors is an integer number (214160747391).

Almost surely, 2^428321494781 is an apocalyptic number.

It is an amenable number.

428321494781 is a deficient number, since it is larger than the sum of its proper divisors (1).

428321494781 is an equidigital number, since it uses as much as digits as its factorization.

428321494781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3096576, while the sum is 53.

The spelling of 428321494781 in words is "four hundred twenty-eight billion, three hundred twenty-one million, four hundred ninety-four thousand, seven hundred eighty-one".