7451981 has 2 divisors, whose sum is σ = 7451982. Its totient is φ = 7451980.

The previous prime is 7451963. The next prime is 7451987. The reversal of 7451981 is 1891547.

7451981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5929225 + 1522756 = 2435^2 + 1234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7451981 is a prime.

It is a super-2 number, since 2×7451981² = 111064041648722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7451987) 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, 3725990 + 3725991.

It is an arithmetic number, because the mean of its divisors is an integer number (3725991).

Almost surely, 2^7451981 is an apocalyptic number.

It is an amenable number.

7451981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7451981 is an equidigital number, since it uses as much as digits as its factorization.

7451981 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 7451981 is about 2729.8316797927. The cubic root of 7451981 is about 195.3247361422.

The spelling of 7451981 in words is "seven million, four hundred fifty-one thousand, nine hundred eighty-one".