55142731 has 8 divisors (see below), whose sum is σ = 66337280. Its totient is φ = 44777448.

The previous prime is 55142723. The next prime is 55142743. The reversal of 55142731 is 13724155.

It is a happy number.

55142731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55142731 - 2³ = 55142723 is a prime.

It is a super-2 number, since 2×55142731² = 6081441564276722, which contains 22 as substring.

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 55142731.

It is not an unprimeable number, because it can be changed into a prime (55142761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207171 + ... + 207436.

It is an arithmetic number, because the mean of its divisors is an integer number (8292160).

Almost surely, 2^55142731 is an apocalyptic number.

55142731 is a deficient number, since it is larger than the sum of its proper divisors (11194549).

55142731 is a wasteful number, since it uses less digits than its factorization.

55142731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414633.

The product of its digits is 4200, while the sum is 28.

The square root of 55142731 is about 7425.8151741071. The cubic root of 55142731 is about 380.6239311321.

Adding to 55142731 its reverse (13724155), we get a palindrome (68866886).

The spelling of 55142731 in words is "fifty-five million, one hundred forty-two thousand, seven hundred thirty-one".