429981781 has 2 divisors, whose sum is σ = 429981782. Its totient is φ = 429981780.

The previous prime is 429981767. The next prime is 429981787. The reversal of 429981781 is 187189924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368985681 + 60996100 = 19209^2 + 7810^2 .

It is a cyclic number.

It is not a de Polignac number, because 429981781 - 2⁹ = 429981269 is a prime.

It is a super-2 number, since 2×429981781² = 369768663983863922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (429981787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214990890 + 214990891.

It is an arithmetic number, because the mean of its divisors is an integer number (214990891).

Almost surely, 2^429981781 is an apocalyptic number.

It is an amenable number.

429981781 is a deficient number, since it is larger than the sum of its proper divisors (1).

429981781 is an equidigital number, since it uses as much as digits as its factorization.

429981781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 49.

The square root of 429981781 is about 20736.0020495755. The cubic root of 429981781 is about 754.7735712674.

The spelling of 429981781 in words is "four hundred twenty-nine million, nine hundred eighty-one thousand, seven hundred eighty-one".