55190042 has 4 divisors (see below), whose sum is σ = 82785066. Its totient is φ = 27595020.

The previous prime is 55190029. The next prime is 55190071. The reversal of 55190042 is 24009155.

It is a Cunningham number, because it is equal to 7429²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 55190041 + 1 = 7429^2 + 1^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55189993 and 55190020.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13797509 + ... + 13797512.

Almost surely, 2^55190042 is an apocalyptic number.

55190042 is a deficient number, since it is larger than the sum of its proper divisors (27595024).

55190042 is a wasteful number, since it uses less digits than its factorization.

55190042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27595023.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 55190042 is about 7429.0000673038. Note that the first 4 decimals coincide. The cubic root of 55190042 is about 380.7327550931.

Adding to 55190042 its reverse (24009155), we get a palindrome (79199197).

The spelling of 55190042 in words is "fifty-five million, one hundred ninety thousand, forty-two".