55212913 has 4 divisors (see below), whose sum is σ = 63100480. Its totient is φ = 47325348.

The previous prime is 55212877. The next prime is 55212929. The reversal of 55212913 is 31921255.

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 55212913 - 2⁹ = 55212401 is a prime.

It is a super-3 number, since 3×55212913³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55212713) 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, 3943773 + ... + 3943786.

It is an arithmetic number, because the mean of its divisors is an integer number (15775120).

Almost surely, 2^55212913 is an apocalyptic number.

It is an amenable number.

55212913 is a deficient number, since it is larger than the sum of its proper divisors (7887567).

55212913 is an equidigital number, since it uses as much as digits as its factorization.

55212913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7887566.

The product of its digits is 2700, while the sum is 28.

The square root of 55212913 is about 7430.5392132738. The cubic root of 55212913 is about 380.7853402815.

The spelling of 55212913 in words is "fifty-five million, two hundred twelve thousand, nine hundred thirteen".