502143661 has 4 divisors (see below), whose sum is σ = 503956732. Its totient is φ = 500330592.

The previous prime is 502143589. The next prime is 502143679. The reversal of 502143661 is 166341205.

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 60933636 + 441210025 = 7806^2 + 21005^2 .

It is a cyclic number.

It is not a de Polignac number, because 502143661 - 2²¹ = 500046509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (502143361) 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, 906120 + ... + 906673.

It is an arithmetic number, because the mean of its divisors is an integer number (125989183).

Almost surely, 2^502143661 is an apocalyptic number.

It is an amenable number.

502143661 is a deficient number, since it is larger than the sum of its proper divisors (1813071).

502143661 is a wasteful number, since it uses less digits than its factorization.

502143661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813070.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 502143661 is about 22408.5622251853. The cubic root of 502143661 is about 794.8331920638.

Adding to 502143661 its reverse (166341205), we get a palindrome (668484866).

The spelling of 502143661 in words is "five hundred two million, one hundred forty-three thousand, six hundred sixty-one".