43780347137 has 2 divisors, whose sum is σ = 43780347138. Its totient is φ = 43780347136.

The previous prime is 43780347071. The next prime is 43780347173. The reversal of 43780347137 is 73174308734.

Together with next prime (43780347173) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39942420736 + 3837926401 = 199856^2 + 61951^2 .

It is a cyclic number.

It is not a de Polignac number, because 43780347137 - 2¹⁸ = 43780084993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43780347091 and 43780347100.

It is not a weakly prime, because it can be changed into another prime (43780340137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21890173568 + 21890173569.

It is an arithmetic number, because the mean of its divisors is an integer number (21890173569).

Almost surely, 2^43780347137 is an apocalyptic number.

It is an amenable number.

43780347137 is a deficient number, since it is larger than the sum of its proper divisors (1).

43780347137 is an equidigital number, since it uses as much as digits as its factorization.

43780347137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 47.

The spelling of 43780347137 in words is "forty-three billion, seven hundred eighty million, three hundred forty-seven thousand, one hundred thirty-seven".