525220981 has 2 divisors, whose sum is σ = 525220982. Its totient is φ = 525220980.

The previous prime is 525220931. The next prime is 525220987. The reversal of 525220981 is 189022525.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 503598481 + 21622500 = 22441^2 + 4650^2 .

It is a cyclic number.

It is not a de Polignac number, because 525220981 - 2⁹ = 525220469 is a prime.

It is a super-2 number, since 2×525220981² = 551714157765204722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525220987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262610490 + 262610491.

It is an arithmetic number, because the mean of its divisors is an integer number (262610491).

Almost surely, 2^525220981 is an apocalyptic number.

It is an amenable number.

525220981 is a deficient number, since it is larger than the sum of its proper divisors (1).

525220981 is an equidigital number, since it uses as much as digits as its factorization.

525220981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 525220981 is about 22917.7001682106. The cubic root of 525220981 is about 806.8274935085.

The spelling of 525220981 in words is "five hundred twenty-five million, two hundred twenty thousand, nine hundred eighty-one".