7085525981 has 6 divisors (see below), whose sum is σ = 7406987070. Its totient is φ = 6777459128.

The previous prime is 7085525971. The next prime is 7085526001. The reversal of 7085525981 is 1895255807.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7078529956 + 6996025 = 84134^2 + 2645^2 .

It is not a de Polignac number, because 7085525981 - 2⁶ = 7085525917 is a prime.

It is a super-2 number, since 2×7085525981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7085525911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6696566 + ... + 6697623.

It is an arithmetic number, because the mean of its divisors is an integer number (1234497845).

Almost surely, 2^7085525981 is an apocalyptic number.

It is an amenable number.

7085525981 is a deficient number, since it is larger than the sum of its proper divisors (321461089).

7085525981 is a wasteful number, since it uses less digits than its factorization.

7085525981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13394235 (or 13394212 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 50.

The square root of 7085525981 is about 84175.5664133007. The cubic root of 7085525981 is about 1920.6903966996.

The spelling of 7085525981 in words is "seven billion, eighty-five million, five hundred twenty-five thousand, nine hundred eighty-one".