261356049 has 24 divisors (see below), whose sum is σ = 395990400. Its totient is φ = 165911328.

The previous prime is 261356047. The next prime is 261356057. The reversal of 261356049 is 940653162.

It is a happy number.

261356049 is a `hidden beast` number, since 261 + 356 + 0 + 49 = 666.

It is not a de Polignac number, because 261356049 - 2¹ = 261356047 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261356047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7302 + ... + 24000.

It is an arithmetic number, because the mean of its divisors is an integer number (16499600).

Almost surely, 2^261356049 is an apocalyptic number.

It is an amenable number.

261356049 is a deficient number, since it is larger than the sum of its proper divisors (134634351).

261356049 is a wasteful number, since it uses less digits than its factorization.

261356049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16789 (or 16786 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 261356049 is about 16166.5101057711. The cubic root of 261356049 is about 639.3581202849.

The spelling of 261356049 in words is "two hundred sixty-one million, three hundred fifty-six thousand, forty-nine".