2169348781 has 2 divisors, whose sum is σ = 2169348782. Its totient is φ = 2169348780.

The previous prime is 2169348763. The next prime is 2169348787. The reversal of 2169348781 is 1878439612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1431411556 + 737937225 = 37834^2 + 27165^2 .

It is a cyclic number.

It is not a de Polignac number, because 2169348781 - 2⁵ = 2169348749 is a prime.

It is a super-2 number, since 2×2169348781² = 9412148267252371922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2169348787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084674390 + 1084674391.

It is an arithmetic number, because the mean of its divisors is an integer number (1084674391).

Almost surely, 2^2169348781 is an apocalyptic number.

It is an amenable number.

2169348781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2169348781 is an equidigital number, since it uses as much as digits as its factorization.

2169348781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 49.

The square root of 2169348781 is about 46576.2684314663. The cubic root of 2169348781 is about 1294.5230686111.

The spelling of 2169348781 in words is "two billion, one hundred sixty-nine million, three hundred forty-eight thousand, seven hundred eighty-one".