261143983 has 2 divisors, whose sum is σ = 261143984. Its totient is φ = 261143982.

The previous prime is 261143963. The next prime is 261144007. The reversal of 261143983 is 389341162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261143983 - 2⁵ = 261143951 is a prime.

It is equal to p_14254966 and since 261143983 and 14254966 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261143903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130571991 + 130571992.

It is an arithmetic number, because the mean of its divisors is an integer number (130571992).

Almost surely, 2^261143983 is an apocalyptic number.

261143983 is a deficient number, since it is larger than the sum of its proper divisors (1).

261143983 is an equidigital number, since it uses as much as digits as its factorization.

261143983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 261143983 is about 16159.9499689820. The cubic root of 261143983 is about 639.1851470452.

The spelling of 261143983 in words is "two hundred sixty-one million, one hundred forty-three thousand, nine hundred eighty-three".