261651525 has 12 divisors (see below), whose sum is σ = 432597312. Its totient is φ = 139547440.

The previous prime is 261651503. The next prime is 261651541. The reversal of 261651525 is 525156162.

It is not a de Polignac number, because 261651525 - 2⁶ = 261651461 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1744269 + ... + 1744418.

It is an arithmetic number, because the mean of its divisors is an integer number (36049776).

Almost surely, 2^261651525 is an apocalyptic number.

261651525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261651525 is a deficient number, since it is larger than the sum of its proper divisors (170945787).

261651525 is a wasteful number, since it uses less digits than its factorization.

261651525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3488700 (or 3488695 counting only the distinct ones).

The product of its digits is 18000, while the sum is 33.

The square root of 261651525 is about 16175.6460458308. The cubic root of 261651525 is about 639.5989715843.

The spelling of 261651525 in words is "two hundred sixty-one million, six hundred fifty-one thousand, five hundred twenty-five".