143923970621 has 4 divisors (see below), whose sum is σ = 144111128700. Its totient is φ = 143736812544.

The previous prime is 143923970581. The next prime is 143923970629. The reversal of 143923970621 is 126079329341.

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 52230074521 + 91693896100 = 228539^2 + 302810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143923970621 is a prime.

It is a super-3 number, since 3×143923970621³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143923970629) 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, 93577886 + ... + 93579423.

It is an arithmetic number, because the mean of its divisors is an integer number (36027782175).

Almost surely, 2^143923970621 is an apocalyptic number.

It is an amenable number.

143923970621 is a deficient number, since it is larger than the sum of its proper divisors (187158079).

143923970621 is an equidigital number, since it uses as much as digits as its factorization.

143923970621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187158078.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 143923970621 in words is "one hundred forty-three billion, nine hundred twenty-three million, nine hundred seventy thousand, six hundred twenty-one".