143781881 has 2 divisors, whose sum is σ = 143781882. Its totient is φ = 143781880.

The previous prime is 143781877. The next prime is 143781931. The reversal of 143781881 is 188187341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119683600 + 24098281 = 10940^2 + 4909^2 .

It is a cyclic number.

It is not a de Polignac number, because 143781881 - 2² = 143781877 is a prime.

It is a super-2 number, since 2×143781881² = 41346458607796322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (143781821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71890940 + 71890941.

It is an arithmetic number, because the mean of its divisors is an integer number (71890941).

Almost surely, 2^143781881 is an apocalyptic number.

It is an amenable number.

143781881 is a deficient number, since it is larger than the sum of its proper divisors (1).

143781881 is an equidigital number, since it uses as much as digits as its factorization.

143781881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 41.

The square root of 143781881 is about 11990.9082641808. The cubic root of 143781881 is about 523.8834999733.

The spelling of 143781881 in words is "one hundred forty-three million, seven hundred eighty-one thousand, eight hundred eighty-one".