13135278731 has 2 divisors, whose sum is σ = 13135278732. Its totient is φ = 13135278730.

The previous prime is 13135278713. The next prime is 13135278743. The reversal of 13135278731 is 13787253131.

Together with previous prime (13135278713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13135278731 is a prime.

It is a super-2 number, since 2×13135278731² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (13135278931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6567639365 + 6567639366.

It is an arithmetic number, because the mean of its divisors is an integer number (6567639366).

Almost surely, 2^13135278731 is an apocalyptic number.

13135278731 is a deficient number, since it is larger than the sum of its proper divisors (1).

13135278731 is an equidigital number, since it uses as much as digits as its factorization.

13135278731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 41.

The spelling of 13135278731 in words is "thirteen billion, one hundred thirty-five million, two hundred seventy-eight thousand, seven hundred thirty-one".