7541981 has 2 divisors, whose sum is σ = 7541982. Its totient is φ = 7541980.

The previous prime is 7541957. The next prime is 7541983. The reversal of 7541981 is 1891457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7513081 + 28900 = 2741^2 + 170^2 .

It is an emirp because it is prime and its reverse (1891457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7541981 - 2²² = 3347677 is a prime.

It is a super-2 number, since 2×7541981² = 113762954808722, which contains 22 as substring.

Together with 7541983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7541983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3770990 + 3770991.

It is an arithmetic number, because the mean of its divisors is an integer number (3770991).

Almost surely, 2^7541981 is an apocalyptic number.

It is an amenable number.

7541981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7541981 is an equidigital number, since it uses as much as digits as its factorization.

7541981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 35.

The square root of 7541981 is about 2746.2667386836. The cubic root of 7541981 is about 196.1079250818.

The spelling of 7541981 in words is "seven million, five hundred forty-one thousand, nine hundred eighty-one".