261684923 has 2 divisors, whose sum is σ = 261684924. Its totient is φ = 261684922.

The previous prime is 261684887. The next prime is 261684989. The reversal of 261684923 is 329486162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261684923 - 2¹⁰ = 261683899 is a prime.

It is not a weakly prime, because it can be changed into another prime (261684223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130842461 + 130842462.

It is an arithmetic number, because the mean of its divisors is an integer number (130842462).

Almost surely, 2^261684923 is an apocalyptic number.

261684923 is a deficient number, since it is larger than the sum of its proper divisors (1).

261684923 is an equidigital number, since it uses as much as digits as its factorization.

261684923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 41.

The square root of 261684923 is about 16176.6783673287. The cubic root of 261684923 is about 639.6261838821.

The spelling of 261684923 in words is "two hundred sixty-one million, six hundred eighty-four thousand, nine hundred twenty-three".