261521496 has 24 divisors (see below), whose sum is σ = 708287580. Its totient is φ = 87173808.

The previous prime is 261521467. The next prime is 261521497. The reversal of 261521496 is 694125162.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 261521496.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261521497) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1816050 + ... + 1816193.

Almost surely, 2^261521496 is an apocalyptic number.

It is an amenable number.

261521496 is an abundant number, since it is smaller than the sum of its proper divisors (446766084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261521496 is a wasteful number, since it uses less digits than its factorization.

261521496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3632255 (or 3632248 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 261521496 is about 16171.6262633045. The cubic root of 261521496 is about 639.4930034203.

The spelling of 261521496 in words is "two hundred sixty-one million, five hundred twenty-one thousand, four hundred ninety-six".