261988148 has 12 divisors (see below), whose sum is σ = 459758880. Its totient is φ = 130628472.

The previous prime is 261988141. The next prime is 261988151. The reversal of 261988148 is 841889162.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261988141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89786 + ... + 92657.

It is an arithmetic number, because the mean of its divisors is an integer number (38313240).

Almost surely, 2^261988148 is an apocalyptic number.

It is an amenable number.

261988148 is a deficient number, since it is larger than the sum of its proper divisors (197770732).

261988148 is a wasteful number, since it uses less digits than its factorization.

261988148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182806 (or 182804 counting only the distinct ones).

The product of its digits is 221184, while the sum is 47.

The square root of 261988148 is about 16186.0479425955. The cubic root of 261988148 is about 639.8731421742.

The spelling of 261988148 in words is "two hundred sixty-one million, nine hundred eighty-eight thousand, one hundred forty-eight".