261956 has 12 divisors (see below), whose sum is σ = 469392. Its totient is φ = 127848.

The previous prime is 261917. The next prime is 261959. The reversal of 261956 is 659162.

261956 = T₃₁ + T₃₂ + ... + T₁₁₆.

It is not an unprimeable number, because it can be changed into a prime (261959) by changing a digit.

261956 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590 + ... + 933.

It is an arithmetic number, because the mean of its divisors is an integer number (39116).

2²⁶¹⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

261956 is a deficient number, since it is larger than the sum of its proper divisors (207436).

261956 is a wasteful number, since it uses less digits than its factorization.

261956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570 (or 1568 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 261956 is about 511.8163733215. The cubic root of 261956 is about 63.9846968620.

The spelling of 261956 in words is "two hundred sixty-one thousand, nine hundred fifty-six".