261431652 has 12 divisors (see below), whose sum is σ = 610007216. Its totient is φ = 87143880.

The previous prime is 261431647. The next prime is 261431663. The reversal of 261431652 is 256134162.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10892974 + ... + 10892997.

Almost surely, 2^261431652 is an apocalyptic number.

It is an amenable number.

261431652 is an abundant number, since it is smaller than the sum of its proper divisors (348575564).

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

261431652 is a wasteful number, since it uses less digits than its factorization.

261431652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21785978 (or 21785976 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 261431652 is about 16168.8481964548. The cubic root of 261431652 is about 639.4197638194.

The spelling of 261431652 in words is "two hundred sixty-one million, four hundred thirty-one thousand, six hundred fifty-two".