525220991 has 2 divisors, whose sum is σ = 525220992. Its totient is φ = 525220990.

The previous prime is 525220987. The next prime is 525221017. The reversal of 525220991 is 199022525.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 525220991 - 2² = 525220987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525220901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262610495 + 262610496.

It is an arithmetic number, because the mean of its divisors is an integer number (262610496).

Almost surely, 2^525220991 is an apocalyptic number.

525220991 is a deficient number, since it is larger than the sum of its proper divisors (1).

525220991 is an equidigital number, since it uses as much as digits as its factorization.

525220991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 525220991 is about 22917.7003863826. The cubic root of 525220991 is about 806.8274986291.

The spelling of 525220991 in words is "five hundred twenty-five million, two hundred twenty thousand, nine hundred ninety-one".