55215629 has 4 divisors (see below), whose sum is σ = 63103584. Its totient is φ = 47327676.

The previous prime is 55215613. The next prime is 55215631. The reversal of 55215629 is 92651255.

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, and also an emirpimes, since its reverse is a distinct semiprime: 92651255 = 5 ⋅18530251.

It is a cyclic number.

It is not a de Polignac number, because 55215629 - 2⁴ = 55215613 is a prime.

It is a super-3 number, since 3×55215629³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55215649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3943967 + ... + 3943980.

It is an arithmetic number, because the mean of its divisors is an integer number (15775896).

Almost surely, 2^55215629 is an apocalyptic number.

It is an amenable number.

55215629 is a deficient number, since it is larger than the sum of its proper divisors (7887955).

55215629 is an equidigital number, since it uses as much as digits as its factorization.

55215629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7887954.

The product of its digits is 27000, while the sum is 35.

The square root of 55215629 is about 7430.7219703068. The cubic root of 55215629 is about 380.7915839660.

The spelling of 55215629 in words is "fifty-five million, two hundred fifteen thousand, six hundred twenty-nine".