261451375 has 16 divisors (see below), whose sum is σ = 329670432. Its totient is φ = 206995200.

The previous prime is 261451357. The next prime is 261451387. The reversal of 261451375 is 573154162.

It is not a de Polignac number, because 261451375 - 2⁷ = 261451247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261451375.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1344 + ... + 22906.

It is an arithmetic number, because the mean of its divisors is an integer number (20604402).

Almost surely, 2^261451375 is an apocalyptic number.

261451375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261451375 is a deficient number, since it is larger than the sum of its proper divisors (68219057).

261451375 is an equidigital number, since it uses as much as digits as its factorization.

261451375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21675 (or 21665 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The square root of 261451375 is about 16169.4580923419. The cubic root of 261451375 is about 639.4358431767.

The spelling of 261451375 in words is "two hundred sixty-one million, four hundred fifty-one thousand, three hundred seventy-five".