155240047 has 4 divisors (see below), whose sum is σ = 155590920. Its totient is φ = 154889176.

The previous prime is 155240017. The next prime is 155240053. The reversal of 155240047 is 740042551.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155240047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155239997 and 155240024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155240017) 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 3 ways as a sum of consecutive naturals, for example, 174772 + ... + 175657.

It is an arithmetic number, because the mean of its divisors is an integer number (38897730).

Almost surely, 2^155240047 is an apocalyptic number.

155240047 is a deficient number, since it is larger than the sum of its proper divisors (350873).

155240047 is an equidigital number, since it uses as much as digits as its factorization.

155240047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350872.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 155240047 is about 12459.5363878437. The cubic root of 155240047 is about 537.4456950364.

Adding to 155240047 its reverse (740042551), we get a palindrome (895282598).

The spelling of 155240047 in words is "one hundred fifty-five million, two hundred forty thousand, forty-seven".