616143261 has 4 divisors (see below), whose sum is σ = 821524352. Its totient is φ = 410762172.

The previous prime is 616143247. The next prime is 616143293. The reversal of 616143261 is 162341616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 616143261 - 2⁹ = 616142749 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 (616143211) 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, 102690541 + ... + 102690546.

It is an arithmetic number, because the mean of its divisors is an integer number (205381088).

Almost surely, 2^616143261 is an apocalyptic number.

It is an amenable number.

616143261 is a deficient number, since it is larger than the sum of its proper divisors (205381091).

616143261 is a wasteful number, since it uses less digits than its factorization.

616143261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205381090.

The product of its digits is 5184, while the sum is 30.

The square root of 616143261 is about 24822.2331992913. The cubic root of 616143261 is about 850.9301287610.

Adding to 616143261 its reverse (162341616), we get a palindrome (778484877).

The spelling of 616143261 in words is "six hundred sixteen million, one hundred forty-three thousand, two hundred sixty-one".