261913523 has 8 divisors (see below), whose sum is σ = 265132848. Its totient is φ = 258714144.

The previous prime is 261913517. The next prime is 261913549. The reversal of 261913523 is 325319162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261913523 - 2⁶ = 261913459 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 261913523.

It is not an unprimeable number, because it can be changed into a prime (261933523) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 22340 + ... + 31982.

It is an arithmetic number, because the mean of its divisors is an integer number (33141606).

Almost surely, 2^261913523 is an apocalyptic number.

261913523 is a deficient number, since it is larger than the sum of its proper divisors (3219325).

261913523 is a wasteful number, since it uses less digits than its factorization.

261913523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9973.

The product of its digits is 9720, while the sum is 32.

The square root of 261913523 is about 16183.7425523270. The cubic root of 261913523 is about 639.8123823420.

The spelling of 261913523 in words is "two hundred sixty-one million, nine hundred thirteen thousand, five hundred twenty-three".