42986143561 has 3 divisors (see below), whose sum is σ = 42986350893. Its totient is φ = 42985936230.

The previous prime is 42986143559. The next prime is 42986143573. The reversal of 42986143561 is 16534168924.

The square root of 42986143561 is 207331.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 42986143561 - 2¹ = 42986143559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42986143661) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 103666 + ... + 310996.

It is an arithmetic number, because the mean of its divisors is an integer number (14328783631).

Almost surely, 2^42986143561 is an apocalyptic number.

42986143561 is the 207331-st square number.

42986143561 is the 103666-th centered octagonal number.

It is an amenable number.

42986143561 is a deficient number, since it is larger than the sum of its proper divisors (207332).

42986143561 is an frugal number, since it uses more digits than its factorization.

42986143561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414662 (or 207331 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

Multiplying 42986143561 by its sum of digits (49), we get a square (2106321034489 = 1451317²).

The spelling of 42986143561 in words is "forty-two billion, nine hundred eighty-six million, one hundred forty-three thousand, five hundred sixty-one".