525186989 has 2 divisors, whose sum is σ = 525186990. Its totient is φ = 525186988.

The previous prime is 525186943. The next prime is 525187031. The reversal of 525186989 is 989681525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 369985225 + 155201764 = 19235^2 + 12458^2 .

It is a cyclic number.

It is not a de Polignac number, because 525186989 - 2¹² = 525182893 is a prime.

It is a super-2 number, since 2×525186989² = 551642746829772242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 525186989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525186289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262593494 + 262593495.

It is an arithmetic number, because the mean of its divisors is an integer number (262593495).

Almost surely, 2^525186989 is an apocalyptic number.

It is an amenable number.

525186989 is a deficient number, since it is larger than the sum of its proper divisors (1).

525186989 is an equidigital number, since it uses as much as digits as its factorization.

525186989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 53.

The square root of 525186989 is about 22916.9585460200. The cubic root of 525186989 is about 806.8100873292.

The spelling of 525186989 in words is "five hundred twenty-five million, one hundred eighty-six thousand, nine hundred eighty-nine".