5242987861 has 4 divisors (see below), whose sum is σ = 5255096812. Its totient is φ = 5230878912.

The previous prime is 5242987831. The next prime is 5242987877. The reversal of 5242987861 is 1687892425.

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 1622558961 + 3620428900 = 40281^2 + 60170^2 .

It is a cyclic number.

It is not a de Polignac number, because 5242987861 - 2¹³ = 5242979669 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5242987799 and 5242987808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5242987811) 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, 6053826 + ... + 6054691.

It is an arithmetic number, because the mean of its divisors is an integer number (1313774203).

Almost surely, 2^5242987861 is an apocalyptic number.

It is an amenable number.

5242987861 is a deficient number, since it is larger than the sum of its proper divisors (12108951).

5242987861 is a wasteful number, since it uses less digits than its factorization.

5242987861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12108950.

The product of its digits is 1935360, while the sum is 52.

The square root of 5242987861 is about 72408.4792065128. The cubic root of 5242987861 is about 1737.2391877795.

The spelling of 5242987861 in words is "five billion, two hundred forty-two million, nine hundred eighty-seven thousand, eight hundred sixty-one".