261453975 has 24 divisors (see below), whose sum is σ = 442328832. Its totient is φ = 136197600.

The previous prime is 261453971. The next prime is 261453989. The reversal of 261453975 is 579354162.

It is not a de Polignac number, because 261453975 - 2² = 261453971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261453971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37311 + ... + 43760.

It is an arithmetic number, because the mean of its divisors is an integer number (18430368).

Almost surely, 2^261453975 is an apocalyptic number.

261453975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261453975 is a deficient number, since it is larger than the sum of its proper divisors (180874857).

261453975 is a wasteful number, since it uses less digits than its factorization.

261453975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81127 (or 81122 counting only the distinct ones).

The product of its digits is 226800, while the sum is 42.

The square root of 261453975 is about 16169.5384906311. The cubic root of 261453975 is about 639.4379627903.

The spelling of 261453975 in words is "two hundred sixty-one million, four hundred fifty-three thousand, nine hundred seventy-five".