52115661 has 12 divisors (see below), whose sum is σ = 81068988. Its totient is φ = 32071104.

The previous prime is 52115653. The next prime is 52115663. The reversal of 52115661 is 16651125.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5616900 + 46498761 = 2370^2 + 6819^2 .

It is not a de Polignac number, because 52115661 - 2³ = 52115653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52115663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222600 + ... + 222833.

It is an arithmetic number, because the mean of its divisors is an integer number (6755749).

Almost surely, 2^52115661 is an apocalyptic number.

It is an amenable number.

52115661 is a deficient number, since it is larger than the sum of its proper divisors (28953327).

52115661 is a wasteful number, since it uses less digits than its factorization.

52115661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445452 (or 445449 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 52115661 is about 7219.1177438798. The cubic root of 52115661 is about 373.5276453573.

Adding to 52115661 its reverse (16651125), we get a palindrome (68766786).

The spelling of 52115661 in words is "fifty-two million, one hundred fifteen thousand, six hundred sixty-one".