55312505 has 4 divisors (see below), whose sum is σ = 66375012. Its totient is φ = 44250000.

The previous prime is 55312501. The next prime is 55312507. The reversal of 55312505 is 50521355.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44049769 + 11262736 = 6637^2 + 3356^2 .

It is not a de Polignac number, because 55312505 - 2² = 55312501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55312501) 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, 5531246 + ... + 5531255.

It is an arithmetic number, because the mean of its divisors is an integer number (16593753).

Almost surely, 2^55312505 is an apocalyptic number.

It is an amenable number.

55312505 is a deficient number, since it is larger than the sum of its proper divisors (11062507).

55312505 is a wasteful number, since it uses less digits than its factorization.

55312505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11062506.

The product of its (nonzero) digits is 3750, while the sum is 26.

The square root of 55312505 is about 7437.2377264681. The cubic root of 55312505 is about 381.0141538729.

The spelling of 55312505 in words is "fifty-five million, three hundred twelve thousand, five hundred five".