55242513 has 16 divisors (see below), whose sum is σ = 82131840. Its totient is φ = 36697392.

The previous prime is 55242497. The next prime is 55242521. The reversal of 55242513 is 31524255.

It is a happy number.

It is not a de Polignac number, because 55242513 - 2⁴ = 55242497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55242613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4420 + ... + 11402.

It is an arithmetic number, because the mean of its divisors is an integer number (5133240).

Almost surely, 2^55242513 is an apocalyptic number.

It is an amenable number.

55242513 is a deficient number, since it is larger than the sum of its proper divisors (26889327).

55242513 is a wasteful number, since it uses less digits than its factorization.

55242513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7285 (or 7279 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 55242513 is about 7432.5307264753. The cubic root of 55242513 is about 380.8533752868.

Adding to 55242513 its reverse (31524255), we get a palindrome (86766768).

It can be divided in two parts, 55242 and 513, that added together give a palindrome (55755).

The spelling of 55242513 in words is "fifty-five million, two hundred forty-two thousand, five hundred thirteen".