216967525 has 6 divisors (see below), whose sum is σ = 269039762. Its totient is φ = 173574000.

The previous prime is 216967523. The next prime is 216967559. The reversal of 216967525 is 525769612.

It can be written as a sum of positive squares in 3 ways, for example, as 49575681 + 167391844 = 7041^2 + 12938^2 .

It is not a de Polignac number, because 216967525 - 2¹ = 216967523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216967523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4339326 + ... + 4339375.

Almost surely, 2^216967525 is an apocalyptic number.

216967525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216967525 is a deficient number, since it is larger than the sum of its proper divisors (52072237).

216967525 is an equidigital number, since it uses as much as digits as its factorization.

216967525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8678711 (or 8678706 counting only the distinct ones).

The product of its digits is 226800, while the sum is 43.

The square root of 216967525 is about 14729.8175480893. The cubic root of 216967525 is about 600.8945222021.

The spelling of 216967525 in words is "two hundred sixteen million, nine hundred sixty-seven thousand, five hundred twenty-five".