7531224553981 has 2 divisors, whose sum is σ = 7531224553982. Its totient is φ = 7531224553980.

The previous prime is 7531224553949. The next prime is 7531224554041. The reversal of 7531224553981 is 1893554221357.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4527068991481 + 3004155562500 = 2127691^2 + 1733250^2 .

It is a cyclic number.

It is not a de Polignac number, because 7531224553981 - 2⁵ = 7531224553949 is a prime.

It is a super-2 number, since 2×7531224553981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7531224553081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3765612276990 + 3765612276991.

It is an arithmetic number, because the mean of its divisors is an integer number (3765612276991).

Almost surely, 2^{7531224553981} is an apocalyptic number.

It is an amenable number.

7531224553981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7531224553981 is an equidigital number, since it uses as much as digits as its factorization.

7531224553981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072000, while the sum is 55.

The spelling of 7531224553981 in words is "seven trillion, five hundred thirty-one billion, two hundred twenty-four million, five hundred fifty-three thousand, nine hundred eighty-one".