6981511 has 4 divisors (see below), whose sum is σ = 7096024. Its totient is φ = 6867000.

The previous prime is 6981503. The next prime is 6981539. The reversal of 6981511 is 1151896.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6981511 - 2³ = 6981503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6981551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57165 + ... + 57286.

It is an arithmetic number, because the mean of its divisors is an integer number (1774006).

Almost surely, 2^6981511 is an apocalyptic number.

6981511 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

6981511 is a deficient number, since it is larger than the sum of its proper divisors (114513).

6981511 is a wasteful number, since it uses less digits than its factorization.

6981511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114512.

The product of its digits is 2160, while the sum is 31.

The square root of 6981511 is about 2642.2549082176. The cubic root of 6981511 is about 191.1245498507.

It can be divided in two parts, 698 and 1511, that added together give a square (2209 = 47²).

The spelling of 6981511 in words is "six million, nine hundred eighty-one thousand, five hundred eleven".