525505891 has 2 divisors, whose sum is σ = 525505892. Its totient is φ = 525505890.

The previous prime is 525505879. The next prime is 525505913. The reversal of 525505891 is 198505525.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 525505891 - 2⁵ = 525505859 is a prime.

It is not a weakly prime, because it can be changed into another prime (525505291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262752945 + 262752946.

It is an arithmetic number, because the mean of its divisors is an integer number (262752946).

Almost surely, 2^525505891 is an apocalyptic number.

525505891 is a deficient number, since it is larger than the sum of its proper divisors (1).

525505891 is an equidigital number, since it uses as much as digits as its factorization.

525505891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90000, while the sum is 40.

The square root of 525505891 is about 22923.9152633227. The cubic root of 525505891 is about 806.9733569810.

The spelling of 525505891 in words is "five hundred twenty-five million, five hundred five thousand, eight hundred ninety-one".