7145289581 has 2 divisors, whose sum is σ = 7145289582. Its totient is φ = 7145289580.

The previous prime is 7145289523. The next prime is 7145289589. The reversal of 7145289581 is 1859825417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7034176900 + 111112681 = 83870^2 + 10541^2 .

It is a cyclic number.

It is not a de Polignac number, because 7145289581 - 2⁶ = 7145289517 is a prime.

It is a super-2 number, since 2×7145289581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7145289589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3572644790 + 3572644791.

It is an arithmetic number, because the mean of its divisors is an integer number (3572644791).

Almost surely, 2^7145289581 is an apocalyptic number.

It is an amenable number.

7145289581 is a deficient number, since it is larger than the sum of its proper divisors (1).

7145289581 is an equidigital number, since it uses as much as digits as its factorization.

7145289581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 50.

The square root of 7145289581 is about 84529.8147460409. The cubic root of 7145289581 is about 1926.0753720269.

The spelling of 7145289581 in words is "seven billion, one hundred forty-five million, two hundred eighty-nine thousand, five hundred eighty-one".