143977921 has 2 divisors, whose sum is σ = 143977922. Its totient is φ = 143977920.

The previous prime is 143977903. The next prime is 143977961. The reversal of 143977921 is 129779341.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79014321 + 64963600 = 8889^2 + 8060^2 .

It is a cyclic number.

It is not a de Polignac number, because 143977921 - 2⁹ = 143977409 is a prime.

It is not a weakly prime, because it can be changed into another prime (143977961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71988960 + 71988961.

It is an arithmetic number, because the mean of its divisors is an integer number (71988961).

Almost surely, 2^143977921 is an apocalyptic number.

It is an amenable number.

143977921 is a deficient number, since it is larger than the sum of its proper divisors (1).

143977921 is an equidigital number, since it uses as much as digits as its factorization.

143977921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 143977921 is about 11999.0800064005. The cubic root of 143977921 is about 524.1214888849.

The spelling of 143977921 in words is "one hundred forty-three million, nine hundred seventy-seven thousand, nine hundred twenty-one".