261953925 has 12 divisors (see below), whose sum is σ = 433097280. Its totient is φ = 139708720.

The previous prime is 261953921. The next prime is 261953927. The reversal of 261953925 is 529359162.

It is not a de Polignac number, because 261953925 - 2² = 261953921 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261953921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1746285 + ... + 1746434.

It is an arithmetic number, because the mean of its divisors is an integer number (36091440).

Almost surely, 2^261953925 is an apocalyptic number.

261953925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261953925 is a deficient number, since it is larger than the sum of its proper divisors (171143355).

261953925 is a wasteful number, since it uses less digits than its factorization.

261953925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492732 (or 3492727 counting only the distinct ones).

The product of its digits is 145800, while the sum is 42.

The square root of 261953925 is about 16184.9907321568. The cubic root of 261953925 is about 639.8452791681.

The spelling of 261953925 in words is "two hundred sixty-one million, nine hundred fifty-three thousand, nine hundred twenty-five".