6981157 has 2 divisors, whose sum is σ = 6981158. Its totient is φ = 6981156.

The previous prime is 6981133. The next prime is 6981181. The reversal of 6981157 is 7511896.

It is a balanced prime because it is at equal distance from previous prime (6981133) and next prime (6981181).

It can be written as a sum of positive squares in only one way, i.e., 5262436 + 1718721 = 2294^2 + 1311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6981157 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6981757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3490578 + 3490579.

It is an arithmetic number, because the mean of its divisors is an integer number (3490579).

Almost surely, 2^6981157 is an apocalyptic number.

It is an amenable number.

6981157 is a deficient number, since it is larger than the sum of its proper divisors (1).

6981157 is an equidigital number, since it uses as much as digits as its factorization.

6981157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 37.

The square root of 6981157 is about 2642.1879191307. The cubic root of 6981157 is about 191.1213194500.

The spelling of 6981157 in words is "six million, nine hundred eighty-one thousand, one hundred fifty-seven".