55143139 has 4 divisors (see below), whose sum is σ = 55175400. Its totient is φ = 55110880.

The previous prime is 55143131. The next prime is 55143169. The reversal of 55143139 is 93134155.

It is a happy number.

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 55143139 - 2³ = 55143131 is a prime.

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 self number, because there is not a number n which added to its sum of digits gives 55143139.

It is not an unprimeable number, because it can be changed into a prime (55143131) 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, 13414 + ... + 17035.

It is an arithmetic number, because the mean of its divisors is an integer number (13793850).

Almost surely, 2^55143139 is an apocalyptic number.

55143139 is a deficient number, since it is larger than the sum of its proper divisors (32261).

55143139 is a wasteful number, since it uses less digits than its factorization.

55143139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32260.

The product of its digits is 8100, while the sum is 31.

The square root of 55143139 is about 7425.8426457877. The cubic root of 55143139 is about 380.6248698729.

The spelling of 55143139 in words is "fifty-five million, one hundred forty-three thousand, one hundred thirty-nine".