304401781 has 2 divisors, whose sum is σ = 304401782. Its totient is φ = 304401780.

The previous prime is 304401761. The next prime is 304401829. The reversal of 304401781 is 187104403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 257602500 + 46799281 = 16050^2 + 6841^2 .

It is a cyclic number.

It is not a de Polignac number, because 304401781 - 2⁵ = 304401749 is a prime.

It is a super-2 number, since 2×304401781² = 185320888551943922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (304401761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152200890 + 152200891.

It is an arithmetic number, because the mean of its divisors is an integer number (152200891).

Almost surely, 2^304401781 is an apocalyptic number.

It is an amenable number.

304401781 is a deficient number, since it is larger than the sum of its proper divisors (1).

304401781 is an equidigital number, since it uses as much as digits as its factorization.

304401781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 304401781 is about 17447.1138300866. The cubic root of 304401781 is about 672.6911741653.

The spelling of 304401781 in words is "three hundred four million, four hundred one thousand, seven hundred eighty-one".