261271525 has 24 divisors (see below), whose sum is σ = 331310144. Its totient is φ = 204336000.

The previous prime is 261271523. The next prime is 261271531. The reversal of 261271525 is 525172162.

It is not a de Polignac number, because 261271525 - 2¹ = 261271523 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 (261271523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 252409 + ... + 253441.

Almost surely, 2^261271525 is an apocalyptic number.

261271525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261271525 is a deficient number, since it is larger than the sum of its proper divisors (70038619).

261271525 is a wasteful number, since it uses less digits than its factorization.

261271525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261 (or 1256 counting only the distinct ones).

The product of its digits is 8400, while the sum is 31.

The square root of 261271525 is about 16163.8957247317. The cubic root of 261271525 is about 639.2891888626.

The spelling of 261271525 in words is "two hundred sixty-one million, two hundred seventy-one thousand, five hundred twenty-five".