55145319 has 4 divisors (see below), whose sum is σ = 73527096. Its totient is φ = 36763544.

The previous prime is 55145303. The next prime is 55145333. The reversal of 55145319 is 91354155.

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 55145319 - 2⁴ = 55145303 is a prime.

It is a super-2 number, since 2×55145319² = 6082012415223522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55145319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55145359) 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, 9190884 + ... + 9190889.

It is an arithmetic number, because the mean of its divisors is an integer number (18381774).

Almost surely, 2^55145319 is an apocalyptic number.

55145319 is a deficient number, since it is larger than the sum of its proper divisors (18381777).

55145319 is a wasteful number, since it uses less digits than its factorization.

55145319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18381776.

The product of its digits is 13500, while the sum is 33.

The square root of 55145319 is about 7425.9894290256. The cubic root of 55145319 is about 380.6298856149.

The spelling of 55145319 in words is "fifty-five million, one hundred forty-five thousand, three hundred nineteen".