55199551 has 4 divisors (see below), whose sum is σ = 60217704. Its totient is φ = 50181400.

The previous prime is 55199549. The next prime is 55199567. The reversal of 55199551 is 15599155.

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 55199551 - 2¹ = 55199549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55199531) 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, 2509060 + ... + 2509081.

It is an arithmetic number, because the mean of its divisors is an integer number (15054426).

Almost surely, 2^55199551 is an apocalyptic number.

55199551 is a deficient number, since it is larger than the sum of its proper divisors (5018153).

55199551 is a wasteful number, since it uses less digits than its factorization.

55199551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5018152.

The product of its digits is 50625, while the sum is 40.

The square root of 55199551 is about 7429.6400316570. The cubic root of 55199551 is about 380.7546200270.

The spelling of 55199551 in words is "fifty-five million, one hundred ninety-nine thousand, five hundred fifty-one".