6981129135 has 24 divisors (see below), whose sum is σ = 12812426640. Its totient is φ = 3504252672.

The previous prime is 6981129109. The next prime is 6981129193. The reversal of 6981129135 is 5319211896.

It is not a de Polignac number, because 6981129135 - 2²² = 6976934831 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4562065 + ... + 4563594.

It is an arithmetic number, because the mean of its divisors is an integer number (533851110).

Almost surely, 2^6981129135 is an apocalyptic number.

6981129135 is a deficient number, since it is larger than the sum of its proper divisors (5831297505).

6981129135 is a wasteful number, since it uses less digits than its factorization.

6981129135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9125687 (or 9125684 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 6981129135 is about 83553.1515563596. The cubic root of 6981129135 is about 1911.2106516537.

The spelling of 6981129135 in words is "six billion, nine hundred eighty-one million, one hundred twenty-nine thousand, one hundred thirty-five".