2147344781 has 2 divisors, whose sum is σ = 2147344782. Its totient is φ = 2147344780.

The previous prime is 2147344777. The next prime is 2147344811. The reversal of 2147344781 is 1874437412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1371220900 + 776123881 = 37030^2 + 27859^2 .

It is a cyclic number.

It is not a de Polignac number, because 2147344781 - 2² = 2147344777 is a prime.

It is a super-2 number, since 2×2147344781² = 9222179216975875922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2147344711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1073672390 + 1073672391.

It is an arithmetic number, because the mean of its divisors is an integer number (1073672391).

Almost surely, 2^2147344781 is an apocalyptic number.

It is an amenable number.

2147344781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2147344781 is an equidigital number, since it uses as much as digits as its factorization.

2147344781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 41.

The square root of 2147344781 is about 46339.4516691771. The cubic root of 2147344781 is about 1290.1313451183.

The spelling of 2147344781 in words is "two billion, one hundred forty-seven million, three hundred forty-four thousand, seven hundred eighty-one".