155216525 has 6 divisors (see below), whose sum is σ = 192468522. Its totient is φ = 124173200.

The previous prime is 155216521. The next prime is 155216527. The reversal of 155216525 is 525612551.

It can be written as a sum of positive squares in 3 ways, for example, as 1605289 + 153611236 = 1267^2 + 12394^2 .

It is not a de Polignac number, because 155216525 - 2² = 155216521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155216491 and 155216500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155216521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3104306 + ... + 3104355.

It is an arithmetic number, because the mean of its divisors is an integer number (32078087).

Almost surely, 2^155216525 is an apocalyptic number.

It is an amenable number.

155216525 is a deficient number, since it is larger than the sum of its proper divisors (37251997).

155216525 is an equidigital number, since it uses as much as digits as its factorization.

155216525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6208671 (or 6208666 counting only the distinct ones).

The product of its digits is 15000, while the sum is 32.

The square root of 155216525 is about 12458.5924164811. The cubic root of 155216525 is about 537.4185490423.

The spelling of 155216525 in words is "one hundred fifty-five million, two hundred sixteen thousand, five hundred twenty-five".