525839981 has 2 divisors, whose sum is σ = 525839982. Its totient is φ = 525839980.

The previous prime is 525839969. The next prime is 525840001. The reversal of 525839981 is 189938525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395651881 + 130188100 = 19891^2 + 11410^2 .

It is a cyclic number.

It is not a de Polignac number, because 525839981 - 2¹⁸ = 525577837 is a prime.

It is a super-2 number, since 2×525839981² = 553015371236160722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525839911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262919990 + 262919991.

It is an arithmetic number, because the mean of its divisors is an integer number (262919991).

Almost surely, 2^525839981 is an apocalyptic number.

It is an amenable number.

525839981 is a deficient number, since it is larger than the sum of its proper divisors (1).

525839981 is an equidigital number, since it uses as much as digits as its factorization.

525839981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 50.

The square root of 525839981 is about 22931.2010370150. The cubic root of 525839981 is about 807.1443316681.

The spelling of 525839981 in words is "five hundred twenty-five million, eight hundred thirty-nine thousand, nine hundred eighty-one".