2420776781 has 2 divisors, whose sum is σ = 2420776782. Its totient is φ = 2420776780.

The previous prime is 2420776753. The next prime is 2420776789. The reversal of 2420776781 is 1876770242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1284075556 + 1136701225 = 35834^2 + 33715^2 .

It is a cyclic number.

It is not a de Polignac number, because 2420776781 - 2¹⁰ = 2420775757 is a prime.

It is a super-2 number, since 2×2420776781² = 11720320446857443922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2420776789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210388390 + 1210388391.

It is an arithmetic number, because the mean of its divisors is an integer number (1210388391).

Almost surely, 2^2420776781 is an apocalyptic number.

It is an amenable number.

2420776781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2420776781 is an equidigital number, since it uses as much as digits as its factorization.

2420776781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 263424, while the sum is 44.

The square root of 2420776781 is about 49201.3900311770. The cubic root of 2420776781 is about 1342.7183218300.

The spelling of 2420776781 in words is "two billion, four hundred twenty million, seven hundred seventy-six thousand, seven hundred eighty-one".