261411644 has 12 divisors (see below), whose sum is σ = 492660504. Its totient is φ = 120651504.

The previous prime is 261411637. The next prime is 261411659. The reversal of 261411644 is 446114162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2513522 + ... + 2513625.

It is an arithmetic number, because the mean of its divisors is an integer number (41055042).

Almost surely, 2^261411644 is an apocalyptic number.

It is an amenable number.

261411644 is a deficient number, since it is larger than the sum of its proper divisors (231248860).

261411644 is a wasteful number, since it uses less digits than its factorization.

261411644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5027164 (or 5027162 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The square root of 261411644 is about 16168.2294639828. The cubic root of 261411644 is about 639.4034512868.

The spelling of 261411644 in words is "two hundred sixty-one million, four hundred eleven thousand, six hundred forty-four".