55212513 has 8 divisors (see below), whose sum is σ = 74503968. Its totient is φ = 36364704.

The previous prime is 55212467. The next prime is 55212523. The reversal of 55212513 is 31521255.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55212513 - 2⁸ = 55212257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55212523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110620 + ... + 111117.

It is an arithmetic number, because the mean of its divisors is an integer number (9312996).

Almost surely, 2^55212513 is an apocalyptic number.

It is an amenable number.

55212513 is a deficient number, since it is larger than the sum of its proper divisors (19291455).

55212513 is a wasteful number, since it uses less digits than its factorization.

55212513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221823.

The product of its digits is 1500, while the sum is 24.

The square root of 55212513 is about 7430.5122972780. The cubic root of 55212513 is about 380.7844207231.

Adding to 55212513 its reverse (31521255), we get a palindrome (86733768).

The spelling of 55212513 in words is "fifty-five million, two hundred twelve thousand, five hundred thirteen".