261875534 has 4 divisors (see below), whose sum is σ = 392813304. Its totient is φ = 130937766.

The previous prime is 261875513. The next prime is 261875563. The reversal of 261875534 is 435578162.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261875491 and 261875500.

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 as a sum of consecutive naturals, namely, 65468882 + ... + 65468885.

It is an arithmetic number, because the mean of its divisors is an integer number (98203326).

Almost surely, 2^261875534 is an apocalyptic number.

261875534 is a deficient number, since it is larger than the sum of its proper divisors (130937770).

261875534 is a wasteful number, since it uses less digits than its factorization.

261875534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130937769.

The product of its digits is 201600, while the sum is 41.

The square root of 261875534 is about 16182.5688319253. The cubic root of 261875534 is about 639.7814471851.

The spelling of 261875534 in words is "two hundred sixty-one million, eight hundred seventy-five thousand, five hundred thirty-four".