7906135781 has 2 divisors, whose sum is σ = 7906135782. Its totient is φ = 7906135780.

The previous prime is 7906135777. The next prime is 7906135807. The reversal of 7906135781 is 1875316097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6850210756 + 1055925025 = 82766^2 + 32495^2 .

It is a cyclic number.

It is not a de Polignac number, because 7906135781 - 2² = 7906135777 is a prime.

It is a super-2 number, since 2×7906135781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7906135751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3953067890 + 3953067891.

It is an arithmetic number, because the mean of its divisors is an integer number (3953067891).

Almost surely, 2^7906135781 is an apocalyptic number.

It is an amenable number.

7906135781 is a deficient number, since it is larger than the sum of its proper divisors (1).

7906135781 is an equidigital number, since it uses as much as digits as its factorization.

7906135781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 7906135781 is about 88916.4539385147. The cubic root of 7906135781 is about 1992.1471887827.

The spelling of 7906135781 in words is "seven billion, nine hundred six million, one hundred thirty-five thousand, seven hundred eighty-one".