55167509 has 4 divisors (see below), whose sum is σ = 56513100. Its totient is φ = 53821920.

The previous prime is 55167491. The next prime is 55167523. The reversal of 55167509 is 90576155.

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 10745284 + 44422225 = 3278^2 + 6665^2 .

It is a cyclic number.

It is not a de Polignac number, because 55167509 - 2¹² = 55163413 is a prime.

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 (55167529) 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, 672734 + ... + 672815.

It is an arithmetic number, because the mean of its divisors is an integer number (14128275).

Almost surely, 2^55167509 is an apocalyptic number.

It is an amenable number.

55167509 is a deficient number, since it is larger than the sum of its proper divisors (1345591).

55167509 is a wasteful number, since it uses less digits than its factorization.

55167509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345590.

The product of its (nonzero) digits is 47250, while the sum is 38.

The square root of 55167509 is about 7427.4833557538. The cubic root of 55167509 is about 380.6809328278.

The spelling of 55167509 in words is "fifty-five million, one hundred sixty-seven thousand, five hundred nine".