261683923 has 2 divisors, whose sum is σ = 261683924. Its totient is φ = 261683922.

The previous prime is 261683911. The next prime is 261683957. The reversal of 261683923 is 329386162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261683923 is a prime.

It is not a weakly prime, because it can be changed into another prime (261684923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130841961 + 130841962.

It is an arithmetic number, because the mean of its divisors is an integer number (130841962).

Almost surely, 2^261683923 is an apocalyptic number.

261683923 is a deficient number, since it is larger than the sum of its proper divisors (1).

261683923 is an equidigital number, since it uses as much as digits as its factorization.

261683923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 261683923 is about 16176.6474586053. The cubic root of 261683923 is about 639.6253691275.

The spelling of 261683923 in words is "two hundred sixty-one million, six hundred eighty-three thousand, nine hundred twenty-three".