143642261 has 12 divisors (see below), whose sum is σ = 173260512. Its totient is φ = 116639784.

The previous prime is 143642237. The next prime is 143642269. The reversal of 143642261 is 162246341.

It is not a de Polignac number, because 143642261 - 2¹⁰ = 143641237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143642269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25895 + ... + 30948.

It is an arithmetic number, because the mean of its divisors is an integer number (14438376).

Almost surely, 2^143642261 is an apocalyptic number.

It is an amenable number.

143642261 is a deficient number, since it is larger than the sum of its proper divisors (29618251).

143642261 is an equidigital number, since it uses as much as digits as its factorization.

143642261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56888 (or 56869 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 143642261 is about 11985.0849392067. The cubic root of 143642261 is about 523.7138719638.

The spelling of 143642261 in words is "one hundred forty-three million, six hundred forty-two thousand, two hundred sixty-one".