261441538 has 24 divisors (see below), whose sum is σ = 430055424. Its totient is φ = 119054400.

The previous prime is 261441511. The next prime is 261441541. The reversal of 261441538 is 835144162.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10623 + ... + 25213.

It is an arithmetic number, because the mean of its divisors is an integer number (17918976).

Almost surely, 2^261441538 is an apocalyptic number.

261441538 is a deficient number, since it is larger than the sum of its proper divisors (168613886).

261441538 is a wasteful number, since it uses less digits than its factorization.

261441538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14658 (or 14641 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 261441538 is about 16169.1539048894. The cubic root of 261441538 is about 639.4278235730.

The spelling of 261441538 in words is "two hundred sixty-one million, four hundred forty-one thousand, five hundred thirty-eight".