55015331 has 4 divisors (see below), whose sum is σ = 62874672. Its totient is φ = 47155992.

The previous prime is 55015327. The next prime is 55015339. The reversal of 55015331 is 13351055.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55015331 - 2² = 55015327 is a prime.

It is a super-2 number, since 2×55015331² = 6053373290079122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55015297 and 55015306.

It is not an unprimeable number, because it can be changed into a prime (55015339) 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, 3929660 + ... + 3929673.

It is an arithmetic number, because the mean of its divisors is an integer number (15718668).

Almost surely, 2^55015331 is an apocalyptic number.

55015331 is a deficient number, since it is larger than the sum of its proper divisors (7859341).

55015331 is an equidigital number, since it uses as much as digits as its factorization.

55015331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7859340.

The product of its (nonzero) digits is 1125, while the sum is 23.

The square root of 55015331 is about 7417.2320308859. The cubic root of 55015331 is about 380.3305779839.

Adding to 55015331 its reverse (13351055), we get a palindrome (68366386).

The spelling of 55015331 in words is "fifty-five million, fifteen thousand, three hundred thirty-one".