525552409 has 2 divisors, whose sum is σ = 525552410. Its totient is φ = 525552408.

The previous prime is 525552359. The next prime is 525552421. The reversal of 525552409 is 904255525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 445843225 + 79709184 = 21115^2 + 8928^2 .

It is a cyclic number.

It is not a de Polignac number, because 525552409 - 2⁷ = 525552281 is a prime.

It is not a weakly prime, because it can be changed into another prime (525552479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262776204 + 262776205.

It is an arithmetic number, because the mean of its divisors is an integer number (262776205).

Almost surely, 2^525552409 is an apocalyptic number.

It is an amenable number.

525552409 is a deficient number, since it is larger than the sum of its proper divisors (1).

525552409 is an equidigital number, since it uses as much as digits as its factorization.

525552409 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 37.

The square root of 525552409 is about 22924.9298581261. The cubic root of 525552409 is about 806.9971674841.

The spelling of 525552409 in words is "five hundred twenty-five million, five hundred fifty-two thousand, four hundred nine".