143781557 has 2 divisors, whose sum is σ = 143781558. Its totient is φ = 143781556.

The previous prime is 143781523. The next prime is 143781587. The reversal of 143781557 is 755187341.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143017681 + 763876 = 11959^2 + 874^2 .

It is an emirp because it is prime and its reverse (755187341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 143781557 - 2¹² = 143777461 is a prime.

It is a super-2 number, since 2×143781557² = 41346272266688498, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143781587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71890778 + 71890779.

It is an arithmetic number, because the mean of its divisors is an integer number (71890779).

Almost surely, 2^143781557 is an apocalyptic number.

It is an amenable number.

143781557 is a deficient number, since it is larger than the sum of its proper divisors (1).

143781557 is an equidigital number, since it uses as much as digits as its factorization.

143781557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 41.

The square root of 143781557 is about 11990.8947539373. The cubic root of 143781557 is about 523.8831064643.

The spelling of 143781557 in words is "one hundred forty-three million, seven hundred eighty-one thousand, five hundred fifty-seven".