55555501 has 4 divisors (see below), whose sum is σ = 56603772. Its totient is φ = 54507232.

The previous prime is 55555481. The next prime is 55555517. The reversal of 55555501 is 10555555.

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 48930025 + 6625476 = 6995^2 + 2574^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55555501 is a prime.

It is a super-2 number, since 2×55555501² = 6172827382722002, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55555531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524056 + ... + 524161.

It is an arithmetic number, because the mean of its divisors is an integer number (14150943).

Almost surely, 2^55555501 is an apocalyptic number.

It is an amenable number.

55555501 is a deficient number, since it is larger than the sum of its proper divisors (1048271).

55555501 is a wasteful number, since it uses less digits than its factorization.

55555501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048270.

The product of its (nonzero) digits is 15625, while the sum is 31.

The square root of 55555501 is about 7453.5562653005. The cubic root of 55555501 is about 381.5712892834.

The spelling of 55555501 in words is "fifty-five million, five hundred fifty-five thousand, five hundred one".