7125400081 has 2 divisors, whose sum is σ = 7125400082. Its totient is φ = 7125400080.

The previous prime is 7125400039. The next prime is 7125400099. The reversal of 7125400081 is 1800045217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4970955025 + 2154445056 = 70505^2 + 46416^2 .

It is an emirp because it is prime and its reverse (1800045217) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7125400081 is a prime.

It is a super-2 number, since 2×7125400081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7125400481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3562700040 + 3562700041.

It is an arithmetic number, because the mean of its divisors is an integer number (3562700041).

Almost surely, 2^7125400081 is an apocalyptic number.

It is an amenable number.

7125400081 is a deficient number, since it is larger than the sum of its proper divisors (1).

7125400081 is an equidigital number, since it uses as much as digits as its factorization.

7125400081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 7125400081 is about 84412.0849227171. The cubic root of 7125400081 is about 1924.2865816235.

Adding to 7125400081 its reverse (1800045217), we get a palindrome (8925445298).

The spelling of 7125400081 in words is "seven billion, one hundred twenty-five million, four hundred thousand, eighty-one".