143761481 has 4 divisors (see below), whose sum is σ = 145184964. Its totient is φ = 142338000.

The previous prime is 143761447. The next prime is 143761489. The reversal of 143761481 is 184167341.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 140185600 + 3575881 = 11840^2 + 1891^2 .

It is a cyclic number.

It is not a de Polignac number, because 143761481 - 2⁶ = 143761417 is a prime.

It is a super-2 number, since 2×143761481² = 41334726838626722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143761489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 711590 + ... + 711791.

It is an arithmetic number, because the mean of its divisors is an integer number (36296241).

Almost surely, 2^143761481 is an apocalyptic number.

It is an amenable number.

143761481 is a deficient number, since it is larger than the sum of its proper divisors (1423483).

143761481 is a wasteful number, since it uses less digits than its factorization.

143761481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423482.

The product of its digits is 16128, while the sum is 35.

The square root of 143761481 is about 11990.0575895197. The cubic root of 143761481 is about 523.8587223291.

Subtracting from 143761481 its sum of digits (35), we obtain a triangular number (143761446 = T₁₆₉₅₆).

The spelling of 143761481 in words is "one hundred forty-three million, seven hundred sixty-one thousand, four hundred eighty-one".