155513242 has 4 divisors (see below), whose sum is σ = 233269866. Its totient is φ = 77756620.

The previous prime is 155513219. The next prime is 155513269. The reversal of 155513242 is 242315551.

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., 109014481 + 46498761 = 10441^2 + 6819^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 155513242.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 38878309 + ... + 38878312.

Almost surely, 2^155513242 is an apocalyptic number.

155513242 is a deficient number, since it is larger than the sum of its proper divisors (77756624).

155513242 is an equidigital number, since it uses as much as digits as its factorization.

155513242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77756623.

The product of its digits is 6000, while the sum is 28.

The square root of 155513242 is about 12470.4948578635. The cubic root of 155513242 is about 537.7607800365.

Adding to 155513242 its reverse (242315551), we get a palindrome (397828793).

The spelling of 155513242 in words is "one hundred fifty-five million, five hundred thirteen thousand, two hundred forty-two".