143557481 has 2 divisors, whose sum is σ = 143557482. Its totient is φ = 143557480.

The previous prime is 143557459. The next prime is 143557487. The reversal of 143557481 is 184755341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112699456 + 30858025 = 10616^2 + 5555^2 .

It is an emirp because it is prime and its reverse (184755341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 143557481 - 2⁶ = 143557417 is a prime.

It is a super-2 number, since 2×143557481² = 41217500702130722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (143557487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71778740 + 71778741.

It is an arithmetic number, because the mean of its divisors is an integer number (71778741).

Almost surely, 2^143557481 is an apocalyptic number.

It is an amenable number.

143557481 is a deficient number, since it is larger than the sum of its proper divisors (1).

143557481 is an equidigital number, since it uses as much as digits as its factorization.

143557481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 38.

The square root of 143557481 is about 11981.5475210842. The cubic root of 143557481 is about 523.6108168695.

The spelling of 143557481 in words is "one hundred forty-three million, five hundred fifty-seven thousand, four hundred eighty-one".