261408943 has 2 divisors, whose sum is σ = 261408944. Its totient is φ = 261408942.

The previous prime is 261408937. The next prime is 261409003. The reversal of 261408943 is 349804162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261408943 - 2²⁵ = 227854511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261405943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130704471 + 130704472.

It is an arithmetic number, because the mean of its divisors is an integer number (130704472).

Almost surely, 2^261408943 is an apocalyptic number.

261408943 is a deficient number, since it is larger than the sum of its proper divisors (1).

261408943 is an equidigital number, since it uses as much as digits as its factorization.

261408943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 261408943 is about 16168.1459357590. The cubic root of 261408943 is about 639.4012490963.

It can be divided in two parts, 26 and 1408943, that added together give a square (1408969 = 1187²).

The spelling of 261408943 in words is "two hundred sixty-one million, four hundred eight thousand, nine hundred forty-three".