143977961 has 2 divisors, whose sum is σ = 143977962. Its totient is φ = 143977960.

The previous prime is 143977921. The next prime is 143977969. The reversal of 143977961 is 169779341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80281600 + 63696361 = 8960^2 + 7981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143977961 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (143977969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71988980 + 71988981.

It is an arithmetic number, because the mean of its divisors is an integer number (71988981).

Almost surely, 2^143977961 is an apocalyptic number.

It is an amenable number.

143977961 is a deficient number, since it is larger than the sum of its proper divisors (1).

143977961 is an equidigital number, since it uses as much as digits as its factorization.

143977961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 47.

The square root of 143977961 is about 11999.0816731948. The cubic root of 143977961 is about 524.1215374221.

The spelling of 143977961 in words is "one hundred forty-three million, nine hundred seventy-seven thousand, nine hundred sixty-one".