4202409781 has 2 divisors, whose sum is σ = 4202409782. Its totient is φ = 4202409780.

The previous prime is 4202409779. The next prime is 4202409811. The reversal of 4202409781 is 1879042024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3945096100 + 257313681 = 62810^2 + 16041^2 .

It is a cyclic number.

It is not a de Polignac number, because 4202409781 - 2¹ = 4202409779 is a prime.

It is a super-2 number, since 2×4202409781² = 35320495934888935922, which contains 22 as substring.

Together with 4202409779, 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 4202409781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4202409751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2101204890 + 2101204891.

It is an arithmetic number, because the mean of its divisors is an integer number (2101204891).

Almost surely, 2^4202409781 is an apocalyptic number.

It is an amenable number.

4202409781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4202409781 is an equidigital number, since it uses as much as digits as its factorization.

4202409781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 4202409781 is about 64825.9961820873. The cubic root of 4202409781 is about 1613.7371592263.

The spelling of 4202409781 in words is "four billion, two hundred two million, four hundred nine thousand, seven hundred eighty-one".